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AUTHENTEC EntrePad AES2501A Manual

Fingerprint sensor
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EntréPad AES2501A FINGERPRINT SENSOR
Product Specification
For Universal Serial Bus Applications
Hardware Reference
2317 Rev 1.1
November 17, 2004
AuthenTec Confidential Information
AuthenTec, Inc.
Post Office Box 2719
Melbourne, Florida 32902-2719
321-308-1300
www.authentec.com
2317Rev 1.1 (17NOV04)

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  • Page 1 EntréPad AES2501A FINGERPRINT SENSOR Product Specification For Universal Serial Bus Applications Hardware Reference 2317 Rev 1.1 November 17, 2004 AuthenTec Confidential Information AuthenTec, Inc. Post Office Box 2719 Melbourne, Florida 32902-2719 321-308-1300 www.authentec.com 2317Rev 1.1 (17NOV04)
  • Page 2 Product Specification for the AES2501A Fingerprint Sensor Copyright ©2004 by AuthenTec, Inc. No part of this publication may be reproduced in any form or by any means without prior written permission. Printed in the United States of America.

  • Page 3: Table Of Contents

    Carrier Null (CARRNULL) (90h)....................40 6.1.1.16 A/D Reference High (ADREFHI) (91h) ..................41 6.1.1.17 A/D Reference Low (ADREFLO) (92h) ..................41 6.1.1.18 Start Column (STRTCOL) (95h) ....................42 6.1.1.19 End Column(ENDCOL) (96h) ...................... 42 AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)
  • Page 4 Image Data Format – 250 ppi....................60 7.1.4 Image Data Format – Monochrome ..................61 7.1.5 Histogram Message Format ...................... 62 7.1.6 Authentication Word Message Format ..................63 PART NUMBERING SCHEME........................ 64 REVISION HISTORY..........................65 AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)
  • Page 5 Table 7-2 Gray Scale Message Format Table 7-3 4 Bit 250 ppi Gray Scale Message Format Table 7-4 Monochrome Packed Message Format Table 7-5 Histogram Message Format Table 7-6 Authentication Word Message Format AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 6: Introducing The Entrépad Aes2501A Slide Sensor

    1. Introducing the EntréPad AES2501A Slide Sensor… …, the latest, lowest cost fingerprint sensor IC for PC Applications. AuthenTec has adapted its patented, award winning TruePrint Technology to read fingerprints while the finger is pulled across the AES2501A's rectangular surface. In this manner, the fingerprint images are acquired AND the sensor is substantially reduced in size.

  • Page 7: Conventions

    When no activity is detected on the system interface bus for approximately 200uS, power is reduced by disabling the internal clocks and the array power is once again turned off. Figure 1-1 Row Numbering AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 8: Navigation Using The Aes2501A

    AuthenTec has application notes to support the integration of the AES2501A for all available interface options. Contact AuthenTec for availability.

  • Page 9: Dc Electrical Characteristics

    2.1 Absolute Maximum Ratings An absolute maximum rating is the maximum value guaranteed by the AuthenTec. The use of a product in violation of these ratings can result in significant loss of device reliability or cause damage to the IC.

  • Page 10: Dc Characteristics @ Recommended Operating Conditions

    Navigation or Finger Detect; Supply Current Vdd=3.3V Suspend Current; USB Figure 2-3 DC Characteristics Currents measured RMS using standard AuthenTec software and drivers. Use of other software or customized register settings may effect actual power consumption. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 11: Sensor Operation

    The image array of the AES2501A sensor is composed of 16x192 pixels. The array is scanned similarly to a sub-array in AuthenTec’s touch sensors. During the imaging process, 16 pixels in a column are powered up, sampled, and converted to 4-bit or 2-bit values.

  • Page 12: Internal Chip Block Diagram

    The following diagram shows a top-level block diagram of the Sensor IC. Excitation Synthesizer Finger Ring Drive Generator Scan Timing Registers Interface Input And Control Output Interface Column Ctrl Pixel Serial Analog Array Ctrl Channel Figure 3-2 Internal Chip Block Diagram AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 13: Packaging & Pin Definitions

    Packaging Information The AES2501A sensor is housed in a plastic 48 Ball Grid Array package. The most current PDF version of this package drawing can always be viewed, printed, or downloaded at: http://www.authentec.com/products/docs/AES2501A_48_BGA_Pkg.pdf AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)
  • Page 14 “keep-out” areas and angles of approach to and from the slide surface. For additional information, contact AuthenTec Applications Engineering for more details. The Pin 1 indicator is a gold triangle located in the corner of the package adjacent to pin one.

  • Page 15: Pin List

    Shared pin definitions for SIO[8:0] are selected by the state of the IOSEL[1:0] pins. Refer to section 5.1 for the interface-specific SIO definitions. The following pin lists match AuthenTec certified reference designs. Certain pin functions will be required to change for other implementations.

  • Page 16: Pin Type And Activity Definitions

    Do Not Connect anything to these pins Static: DC or slowly changing voltages Active: Active Signals, Digital or Analog VDDL: Fixed Active High Logic Level VSSL: Fixed Active Low Logic Level VDDA: Pixel Array Power supply pin AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 17: Pin Descriptions

    Pin Descriptions Signal Name Function Description For pins D8-D12, Refer to the appropriate AuthenTec Reference Design for connection details CLKSEL0 Clock input option selection. Refer to section 4.4 CLKSEL1 Clock input option selection. Refer to section 4.4 CLKSEL2 Clock input option selection. Refer to section 4.4 Filter Capacitor - connect to pin A2 through a 0.1uF capacitor, standard bypass type...

  • Page 18: Clock Select Control

    Appropriate application of clock sources is driven the desired circuit application (interface type) and reference design. This section addresses the specification requirements for an externally driven clock. All electrical and environmental conditions from the device specification apply as well. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 19: Figure 4-3 External Clock Specifications

    When driving an external clock into the SYSCLK device pin, the following timing diagram applies: Parameter Minimum Maximum Freq. (USB 12MHz – 12MHz + 0.25% Interface) 0.25% Jitter (USB 0.2ns Interface) Thigh 45%*[Tperiod] 55%*[Tperiod] Tlow 45%*[Tperiod] 55%*[Tperiod] Figure 4-3 External Clock Specifications AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 20: Timing Information

    Sending a master reset to the device does not affect the setting of the reference delay value used for the finger detect calculation. If desired, the device can be re-calibrated by setting the Recalibrate FD bit [Reg82-D2], which is self-clearing. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 21: System Interface Descriptions

    SIO4 / B12 PID2 SIO5 / B11 PID3 SIO6 / B10 SIO7 / B9 SIO8 / C9 ENUM Figure 5-1 SIO Pin Definitions for the USB Interface AuthenTec Vendor ID = 08FFh, Product ID= 258xh AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 22: Usb Interface

    Product ID high byte bcdDevice(L) Device ID Device ID (L) bcdDevice(H) Device ID Device ID (H) iManufacturer None iProduct Product String – “Fingerprint Sensor” iSerialNumber None bNumConfigurations One configuration in this interface Table 5-1 Device Descriptor AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 23: Table 5-3 Default Configuration Descriptor

    Out endpoint, endpoint #2 bmAttributes xfr type = Bulk wMaxPacketSize(L) Max Packet Size = 8 bytes wMaxPacketSize(H) bInterval Polling interval in milliseconds Table 5-4 Default Interface 0, Alternate Setting 0, Bulk Endpoint Descriptors AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 24: Reset

    A nominal value of 47nF may be used to provide a proper reset to the device. A valid reset is achieved if the reset is still active (less than 2/3 of the VDD rail voltage) for 3 mS after the Vdd voltage has reached the specification limits. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 25: Software Interface Details

    - Navigation Word [31] Word [30] Word [29] [28] / Right Down Left Challenge Challenge Challenge Challenge Challenge Challenge Challenge Word Word [27] Word [26] Word [25] Word [24] Word [23] Word [22] [21] AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 26: Table 6-1 Registers Summary

    R e a d O n ly Table 6-1 Registers Summary The following sections describe the functional settings for each active Register. Registers which are entirely reserved are not shown in the description sections below. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 27: Control Register 1 (Ctrl1)

    This bit is self-resetting and will always read back as zero. This reset does not affect GPIO register settings. Headings in bold denote default state functionality AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 28: Control Register 2 (Ctrl2)

    Imaging mode. This bit is self-resetting and will always read back as zero. Continuous Scan Continuous Scan. As long as the necessary conditions are met, image scans will be performed. Controlled Scan. Single scans are initiated by writing a ‘1’ to the Set One-Shot bit. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 29: Excitation Common Controls (Excitctrl) (82H)

    This bit is self-resetting and always reads back as a ‘0’. Timer Free Run SOF TIMESTAMP is a free running counter, with lsb changing every 16us. SOF TIMESTAMP is updated at start of frame, normal operation. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 30: Detect Control (Detctrl)

    Nav. Off time = 4ms (packet spacing 10ms). Nav. Off time = 4ms (packet spacing 10ms). Nav. Off time = 8ms (packet spacing 14ms). Nav. Off time = 16ms (packet spacing 22ms). Nav. Off time = 32ms (packet spacing 38ms). AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 31: Navigation Correlation Range (Navcorrnge) (84H)

    Sets the threshold for image based finger detect in navigation mode. It is used to determine if there is a sufficient amount of pixel data in the center column to do up/down direction determination vs. left/right determination. See Register 0x84 for additional options. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 32: Navigation Control (Navctrl)

    Sets threshold for image correlation. When ‘Up’ correlation results are compared to ‘Down’ correlation results, the difference between them must be greater than NAV_THRESH in order for a direction answer to be generated. This register is used to adjust correlation sensitivity. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 33: Detect Frequency (Detfreq) (87H)

    Detect Frequency Sets the frequency of the excitation generator when in Detect mode. Out of range values default to the 2 MHz setting. 125 KHz 250 KHz 500 KHz 1 MHz 2 MHz AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 34: Column Scan Rate (Colscan)

    0100 128 us 0101 256 us 0110 512 us 0111 1024 us 1000 2048 us 1001 4096 us 1010 8192 us 1011 16384 us 1100 32768 us 1101 65536 us 111X 65536 us AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 35: Measure Drive (Vdctrlmd) (89H)

    Selects square wave drive during measure Selects sine wave drive during measure Measure Drive Sets the drive level of the excitation generator when using sine wave in Measure mode. 0.325 V 0.65 V 1.3 V 2.6 V AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 36: Measure Frequency (Measfreq) (8Ah)

    For best results, the measurement frequency and column scan rate should be selected so that at least 16 cycles of the measurement frequency occur during the integration time period (see column scan rate). AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 37: Demod Phase 1(Demodphase1)

    The bit weighting has the following relative scales: Bit[13] – bit weight = 180 degrees Bit[7] – bit weight = 2.8125 degrees Bit[6] – bit weight = 1.40625 degrees Bit[0] – bit weight = 0.02197256 degrees Default phase is 40h. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 38: Channel Gain (Changain)

    Value Sensor Gain #2 Sets the gain in the second stage of the analog channel (channel buffer). Sensor Gain #1 Sets the gain in the first stage of the analog channel (array buffer). AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 39: Channel Bias (Chanbias)

    90 uA 180 uA 360 uA 720 uA The total expected analog channel current (IVDDA3) due to these settings is sixteen times the sum of the two currents (the analog channel is sixteen wide). AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 40: Carrier Null (Carrnull)

    Vstep = 0.103125 * [setting+1]; based on Vdd = 3.30V Value Voos Output Step 000000 0.0515625 V 0.0 V 000001 0.103125 V -0. 0515625 V 111110 3.2484375 V -3.196875V 111111 -3.2484375V AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 41: A/D Reference High (Adrefhi)

    Value A/D Reference Low Sets the low reference voltage to the A/D converter. The actual voltage reference to the A/D is (Vdd/128) * (setting + 1); based on Vdd = 3.30V. [default 20h] AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 42: Start Column (Strtcol)

    2 bits and set the lowers to lsb’s to ‘1’ to get the actual end column]. The end column should not be set lower than the start column. Register settings that result in the end column being greater than 191 will select an end column of 191. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 43: Data Format (Datfmt)

    Reserved Reserved Bin. Threshold Sets the binarization threshold value for 1-bit per pixel mode. Pixels with A/D values greater than or equal to the threshold value are sent as a one. [default 08h] AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 44: Image Data Control (Imagctrl)

    Image Data Disable The image data message and authentication message are not returned when imaging. The image data message and authentication word message are returned. Note: the histogrammer works on raw pixel data. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 45: Gpio Data (Gpiodata) (99H)

    4. GPIO pins are affected by power on reset only. Software Master Reset has no effect. GPIO3 Sets GPIO3 high. Sets GPIO3 low GPIO2 Sets GPIO2 high. Sets GPIO2 low. GPIO1 Sets GPIO1 high. Sets GPIO1 low. GPIO0 Sets GPIO0 high. Sets GPIO0 low. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 46: Sensor Status (Stat)

    Waiting for Scan End. 1100 Waiting for Row Setup. 1101 Waiting for one column time (depends on scan rate) 1110 Waiting for queued data transmission to be completed 1111 Wait for 128 us. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 47: Challenge Word 1 (Chword1)

    Word Word Word Word Word Word Word [26]/ [25]/] [24]/ [23]/] [22]/] [21]/] [27]/ Reset Value WRITE Challenge Word [27:21] Writing to this register alters bits 32 through 25 of the challenge word. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 48: Challenge Word 3 (Chword3)

    Challenge Challenge Challenge Challenge Challenge Reserved Challenge Word Word Word Word Word Word Word Reset Value WRITE Challenge Word [6:0] Writing to this register alters bits 7 through 0 of the challenge word. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 49: Test Register 1 (Treg1)

    2.5 uA 5 uA 8 uA 10 uA The table below shows the recommended minimum bias settings based on the measure frequency. Frequency 125 KHz 250 KHz 500 KHz 1 MHz 2 MHz AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 50: Fd Threshold (Fdthreshold)

    Detect resistor is nominally = 1K ohm. FD Threshold[3:0] Sets the Timer-based finger-detect delay threshold. Measured delay values above the setting in this register will cause the FINGER PRESENT condition to be true when using delay based finger detect. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 51: Miscellaneous Control (Miscctrl)

    The register read command will produce only 2 bytes, the register address header for the register selected in ADh, and the register contents for that address. Register read produces full register set at selected interface. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 52: Single Reg. Address (Sregaddr)

    Reg ID Reg ID Reg ID Reg ID Reg ID Reg ID Reg ID Reset Value When reading single register contents is enabled (REG ACh), this register identifies which register address will be read. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 53: Fdrv X Hi (Fdrvxhi)

    FDRV X[4] FDRV X[3] FDRV X[2] FDRV X[1] FDRV X[0] Reset Value FDRV X[6:0] READ ONLY If Register 0x83-D6 = 0 FCRV X = FDRV_DELAY[6:0]. If Register 0x83-D6 = 1 FCRV X = FDRV_REFERENCE[6:0] AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 54: Watchdog Control (Wdctrl)

    Watchdog Timer[2:0] – Selects timeout value for watchdog timer. Required settings for system use are 2 seconds or above 15 ms 100ms 500ms 1 second 2 seconds 3 seconds 4 seconds 5 seconds AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 55: Misc. Image Control/Gpio Disable(Miscictrl) (B3H)

    GPIO1 output is disabled, pin may be used as an input. GPIO1 pin is an output. GPIO0 Disable GPIO0 output is disabled, pin may be used as an input. GPIO0 pin is an output. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 56: Sof Timestamp/Freerun[13:7] (Softimehigh) (Bah)

    Timestamp Timestamp Timestamp [13] [12] [11] [10] Reset V alue EOF Timestamp[13:7] READ ONLY This register indicates the upper 7 bits of the end of imaging timestamp. This is a free running counter. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 57: Eof Timestamp[6:0] (Eoftimelow)

    (BDh) Timestamp Timestamp Timestamp Timestamp Timestamp Timestamp Timestamp Reset Value EOF Timestamp[6:0] READ ONLY This register indicates the lower 7 bits of the end of imaging timestamp. This is a free running counter. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 58: Data Formats

    = 384 bytes. In 250 ppi Mode, the array message is 96 columns x 8 pixels per column x 1/8 byte per pixel = 96 bytes. F1h –FFh Reserved. Table 7-1 Command Byte Definition AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 59: Registers Message Format

    The authentication data is sent lower byte first. The register values are then returned, with each register preceded by the command byte for the register. The register values are the ones that were in effect during the image. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 60: Image Data Format - 250 Ppi

    The authentication data is sent lower byte first. The register values are then returned, with each register preceded by the command byte for the register. The register values are the ones that were in effect during the image. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 61: Image Data Format - Monochrome

    The 64-bit value from four columns updates the authentication word in the same manner as for normal data. After all data for the selected number of rows is sent, the authentication word and register data are sent as in normal mode. AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 62: Histogram Message Format

    This is followed by the counts for the remaining bins Byte Data (D6 – D0) Header (0xDE) Bin0[6:0] Bin0[13:7] Bin1[6:0] Bin1[13:7] Bin2[6:0] Bin15[6:0] Bin15[13:7] Table 7-5 Histogram Message Format AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 63: Authentication Word Message Format

    Data (D6 – D0) Header (0xDF) Authentication Word [7:0] Authentication Word [15:8] Authentication Word [23:16] Authentication Word [31:24] Authentication Word [39:32] Authentication Word [47:40] Authentication Word [55:48] Authentication Word [63:56] Table 7-6 Authentication Word Message Format AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

  • Page 64: Part Numbering Scheme

    GO = Gold NI = Nickel EE = Options 0A = Silicon revision code in 2501A series* * Contact AuthenTec Sales for current revision code. Example: AES2501A with Gold ring, Lead-free solder balls, shipped as tape reels: AES2501A-C-GF-TR-GO0A AuthenTec Confidential Information...

  • Page 65: Revision History

    28 Oct 04 Updates for 2501A – A10 Pin change to PLL_FILTER Pin change necessitates new part number. PID Update, Pin 1 Marking data, Register B0 change, 17 Nov 04 Updated Reset Register Values AuthenTec Confidential Information 2317 Rev 1.1 (17NOV04)

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