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External Power Supply Requirements
•
The TPS81256 in the microcontroller board regulates the 5-V supply of the analog-to-digital converter
(ADS1255), transimpedance amplifiers circuits (OPA350 and OPA2276), and 2.5-V reference voltage
(REF5025) used in the detector board.
•
A second TPS81256 in the DLP controller board regulates the 5-V supply for the lamp driver (OPA567
and INA213). The lamp driver drives two parallel lamps at 5 V and 280 mA. Each lamp is rated to a
maximum 140 mA at 5 V.
•
The TPS386596 serves as reset supervisor to hold the system in reset whiles all the supplies reach
operational conditions. An external reset button issues a reset when the system has reached
operational conditions.
For detailed connections of these devices, refer to the DLP NIRscan Nano schematics.
BQ24250
IN
274k
VDPM
(4.36V)
107k
ILM (1A)
150
SYS
ISET (1A)
249
BAT +
BAT
LDO
TEMP
TS
BAT
Conn
STAT
BAT -
1.5K
Emergency Shutdown Logic to allow
sufficient time for DLPA2005
to issue a Fast Park
EN logic
PROJ_ON
RESETz
INTz
EN
SYSPWR
EN = SYSPWR (~PROJ _ON + ~RESETz + INTz)
PROJ_ON
Legend
Power Management
DLP chipset
DLP
Analog
Figure 4-2
shows the Tiva connections to the components on the microprocessor board and detector
board. The Tiva uses a 16-MHz external crystal as input to its on-board PLL to run the Tiva system at 120
MHz. A 32-kHz crystal supplies the clock to the Tiva's hibernation module and Bluetooth circuits. An
external 32MB of SDRAM stores the patterns that are streamed to the DLPC150 through the Tiva's LCD
interface. Tiva communicates to the HDC1000 and TMP006 sensors through its I2C6 and I2C7
peripherals. Both sensors generate a DRDY signal when a new value is available. This DRDY signals
interrupt Tiva when a new value is available through PP7 for HDC1000 and PP6 for TMP006. Tiva's
UART3 communicates with the CC2564MODN for Bluetooth transfers. The UART3 defaults to a 115200
baud transfer rate. Tiva's PH5 enables the Bluetooth circuits. Tiva interfaces to the microSD card through
32
DLP NIRscan Nano Hardware
DLPA2005
VLED
VINC
VINL
SW4
VINR
VCORE
VINM
RESETZ
VINA
INTZ
LS_IN
LS_OUT
VRST
VBIAS
Tiva
PROJ_ON
VOFS
PJ7
TPS82671
(600 mA)
VIN
VOUT1
EN
3.53 - 4.2V
TPS63036
(500 mA)
VIN
VOUT1
EN
28.7K
EN
logic
TPS81256
(400 mA)
VIN
VOUT1
EN
EN
logic
TPS81256
VIN
VOUT1
LS
EN
Tiva PD2
LS
Figure 4-1. DLP NIRscan Nano Power Block Diagram
Copyright © 2015, Texas Instruments Incorporated
Tiva PJ7
P1P1V
P1P8V_SW
P1P8V
TPS22904
P1P8V_BT
VIN
VOUT1
Tiva
EN
PB2
P3P3V
TPS386596
(Reset Sup)
SENSE1
SENSE2
10K
SENSE3
VIN
RESETZ
95.3K
SENSE4
10K
MRZ
P5P0V
OPA567
VCC (300 mA)
V+
OUT
EN
V-
0.1
INA213
IN-
OUT
V+
IN+
DLPC150
PROJ_ON
LS
PROJ_ON
VDD
(252.9 mA)
VDDLP12
VDD_PLL
VDD_PLLM (6 mA)
VDD_PLLD (6 mA)
RESETZ
PARKZ
VCC18 (12.62 mA)
VCC_FLSH (1.0 mA)
VCC_INTF (1.5 mA)
CC2564MODN
VDD_IN (41.2 mA)
VDD_IO (1 mA)
-14V
DLP2010NIR
18V
VDD
(34.7mA)
VDDI
(9.4mA)
10V
VRESET
(2 mA)
VBIAS
(0.4 mA)
VOFFSET (1.7 mA)
TM4C129
VBAT
VDD (117 mA)
VDDA
RESETZ
ADS1255
100K
DVDD (2 mA)
RESETZ
AVDD (50 mA)
OPA350
REF5025
VCC (8.5 mA)
VIN (1.2 mA)
V+
VOUT1
OPA2376
VCC (1 mA)
V-
DLPU030B – June 2015 – Revised July 2015
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www.ti.com
VDDC
2.5uF
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