Related Manuals for Microchip Technology SA5 Series
Summary of Contents for Microchip Technology SA5 Series
- Page 1 Miniature Atomic Clock (MAC) SA5X User’s Guide 2019 Microchip Technology Inc. DS50002938A...
- Page 2 Technology, and Symmcom are registered trademarks of Microchip Technology Inc. in other countries. GestIC is a registered trademark of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in other countries. All other trademarks mentioned herein are property of their respective companies.
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Page 3: Preface
• Chapter 5. “Maintenance and Troubleshooting”: Contains maintenance and troubleshooting procedures for the product. Also contains procedures for return- ing the MAC. • Appendix A. “Principle of Operation”: Briefly explains Atomic Interrogation and 2019 Microchip Technology Inc. DS50002938A-page 3... -
Page 4: Conventions Used In This Guide
Note: All notes use this style. Notes contain installation, operation, or mainte- nance procedures, practices, conditions, or statements that alert you to important information that may make your task easier or increase your understanding. 2019 Microchip Technology Inc. DS50002938A-page 4... -
Page 5: Where To Find Answers To Product And Document Questions
• General Technical Support – Frequently Asked Questions (FAQs), technical support requests, online discussion groups, Microchip consultant program member listing 2019 Microchip Technology Inc. DS50002938A-page 5... -
Page 6: Customer Support
Technical support is available through the website at: http://www.microchip.com/support. DOCUMENT REVISION HISTORY Revision A (November 2019) • Initial release of this document as Microchip DS50002938A. - Under Microsemi’s literature system, this document is number 900-44500-000, Rev. A. 2019 Microchip Technology Inc. DS50002938A-page 6... -
Page 7: Table Of Contents
3.4 1PPS Disciplining ..................23 3.4.1 Theory ......................23 3.4.2 Selection of Disciplining Time Constant, “Tau”........... 25 3.4.3 JamSync..................... 26 3.4.4 1PPS Phase Measurement Mode .............. 26 3.4.5 Cable Length Compensation ..............26 2019 Microchip Technology Inc. DS50002938A-page 7... - Page 8 D.2.1 Communications Connections..............57 D.2.2 Input Connections ..................58 D.2.3 Output Connections..................58 D.2.4 Power Connections ..................58 D.2.5 Functional Description and Operation ............58 D.2.5.1 Troubleshooting................59 Appendix E. Software License Agreements ..............61 Worldwide Sales and Service ..................63 2019 Microchip Technology Inc. DS50002938A-page 8...
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Page 9: Chapter 1. Product Overview
The 1PPS input allows users to quickly calibrate frequency and phase of the MAC to a primary clock such as GPS, while the RF and 1PPS outputs provide highly stable hold- over references. FIGURE 1-1: The Miniature Atomic Clock (MAC) SA5X. 2019 Microchip Technology Inc. DS50002938A-page 9... -
Page 10: Key Features
Nickel-plated Aluminum baseplate and black anodized Aluminum cover. All connec- tions for the MAC are on the baseplate. Figure 1-2 shows the top cover on the left and the bottom baseplate on the right. Figure 2-1 for a complete mechanical drawing. 2019 Microchip Technology Inc. DS50002938A-page 10... -
Page 11: Communications Connections
MAC digitally via the serial/USB interface. • 1PPS Input (x2): Two selectable LVDS 1PPS inputs can be provided on pins J1-5,7 (PPS0-IN) or J1-1,3 (PPS1-IN) for aligning the MAC’s frequency and timing 2019 Microchip Technology Inc. DS50002938A-page 11... -
Page 12: Output Connections
The MAC offers two selectable 1PPS inputs for use in steering the output RF (and 1PPS Output, simultaneously). PPS_Input_0 (pins J1-5,7) and PPS_Input_1 (pin J1-1,3) are selectable with the PpsSource parameter. Their 1PPS Disciplining set- 2019 Microchip Technology Inc. DS50002938A-page 12... -
Page 13: Configuration Management
The Command Line Interface can be used to control specific functions of the MAC from a terminal connected to the RS-232 serial port or the USB port. Refer to Chapter 4. “Command Line Interface” for further details. 2019 Microchip Technology Inc. DS50002938A-page 13... -
Page 14: Alarms
Lock or tempera- ture warning. These alarms are indicated by CLI status and the alarm pin. For more information, see Section 3.5 “Device Information and Status” and Section 4.4.3 “Alarms Parameter”. 2019 Microchip Technology Inc. DS50002938A-page 14... -
Page 15: Chapter 2. Installation
PCB. The recommended socket for PCB attachment is Mill-Max 0332-0-43-80-18-27-10-0. After evaluation, the pins can be hand-soldered to a PCB. Below is the mechanical drawing (ICD). Contact Microchip for latest revision. FIGURE 2-1: ICD 697-00498-000 for MAC. 2019 Microchip Technology Inc. DS50002938A-page 15... - Page 16 WARNING To avoid the possibility of a burn, mount the SA5X to a heat-dissipating surface. The SA5X operates at a temperature that is hot to the touch and may cause handling dis- tress. 2019 Microchip Technology Inc. DS50002938A-page 16...
- Page 17 (caused by the turn-on current or quiescent operat- ing current) could cause the input voltage to drop below the specified allowable value. Signal Connections The SA5X pinout is shown in Figure 2-3. FIGURE 2-3: Pinout. 2019 Microchip Technology Inc. DS50002938A-page 17...
- Page 18 Signal and Supply. It is recommended to tie this ground to same node as baseplate ground Pin 2. BITE output (active-low): 0 = Normal Operation 1 = Unlock Condition If connecting to COM port of a computer, a TTL/RS-232 (or HCMOS/RS-232) adapter is necessary. 2019 Microchip Technology Inc. DS50002938A-page 18...
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Page 19: Absolute Minimum And Maximum Ratings
The baseplate temperature (solid orange trace) will generally rise ~15°C during the start-up sequence, but this varies greatly with thermal management (heat sink, airflow, etc). Generally, the temperature rise will be smaller at warmer temperatures, larger at colder temperatures. 2019 Microchip Technology Inc. DS50002938A-page 19... - Page 20 (Monthly Aging frequency drift rate) is satisfied within 30 days of continuous power at room temperature. There are no maintenance procedures or adjustments needed, aside from frequency adjustment which is described in a later section. 2019 Microchip Technology Inc. DS50002938A-page 20...
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Page 21: Chapter 3. Operation
DC correction voltage. Analog tuning is an inferior approach compared to Digital tun- ing or 1PPS Disciplining because its resolution is only parts in 10 . However, it has been carried forward to support legacy applications. 2019 Microchip Technology Inc. DS50002938A-page 21... -
Page 22: Digital Tuning
Note: Once a calibration is overwritten, it cannot be recalled. Note: The latch command is only valid when the MAC is locked (Locked = 1). Note: Total net steering range is limited to ±1x10 . See data sheet for exact specification. 2019 Microchip Technology Inc. DS50002938A-page 22... -
Page 23: 1Pps Disciplining
The status of disciplining is indicated by the DisciplineLocked parameter in the telemetry. DisciplineLocked = 0 upon algorithm startup or when a valid PPS input signal is not detected. DisciplineLocked = 1 when magnitude of the phase mea- 2019 Microchip Technology Inc. DS50002938A-page 23... - Page 24 Note: The user is allowed to adjust the DigitalTuning parameter while in Dis- ciplining mode. However, this is discouraged because it could prolong and disrupt the disciplining algorithm. 2019 Microchip Technology Inc. DS50002938A-page 24...
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Page 25: Selection Of Disciplining Time Constant, "Tau
A rough approximation would be to measure the 1s ADEV performance of a GNSS and extrapolate the curve proportional to 1/√(Tau). 2019 Microchip Technology Inc. DS50002938A-page 25... -
Page 26: Jamsync
The phase measurement, as reported through teleme- try, reports the actual phase measurement. That is, if the MAC is disciplined with +50 ns of compensation, the phase meter reports –50 ns of phase dif- ference when disciplining is settled. 2019 Microchip Technology Inc. DS50002938A-page 26... -
Page 27: Pps Quantization Error Correction
The MAC maintains a TOD parameter TimeOfDay as a 32-bit unsigned integer, which is incremented synchronously with the rising edge of the 1PPS output. Until set other- wise, TOD begins counting from zero when the MAC is powered on. 2019 Microchip Technology Inc. DS50002938A-page 27... - Page 28 MAC-SA5X User’s Guide NOTES: 2019 Microchip Technology Inc. DS50002938A-page 28...
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Page 29: Chapter 4. Command Line Interface
Signifies the end of a command. The sequence number, arguments, and checksum fields are optional. If a command is entered incorrectly, MAC will reply with the appropriate error message (See Section 4.2.1 “Error Responses”). 2019 Microchip Technology Inc. DS50002938A-page 29... -
Page 30: Command Structure
Section 4.2.1 “Error Responses”). The command should be re-sent. RESPONSE STRUCTURE The structure of a C3 response follows: [#XX=value|XX]<CR><LF> Where: TABLE 4-3: RESPONSE STRUCTURE Field Description Usage Indicates the start of a response. Always 2019 Microchip Technology Inc. DS50002938A-page 30... -
Page 31: Command Checksum
The client aborted the file transfer. canceled by client Synchronization error A file transfer synchronization error occurred. Transfer failed – The file transfer was aborted due to an unsup- Unsupported request ported request. 2019 Microchip Technology Inc. DS50002938A-page 31... -
Page 32: Response Checksum
Parameters are uniquely identified by either a numeric id (e.g. 769) or a name (e.g. PpsSource). The device provides a set of commands to indicate which parameters are available to the user and to describe each one, including name string, real world units, whether it’s writable, etc. 2019 Microchip Technology Inc. DS50002938A-page 32... -
Page 33: Parameter Index
10 to 45,000 TauPps1 using PPS Input 1. Metering of 1PPS phase offset with- out corrections is enabled. Default is Boolean 0 or 1 PhaseMetering false. Cannot be enabled simultane- ously with disciplining. 2019 Microchip Technology Inc. DS50002938A-page 33... -
Page 34: Parameter Attributes
• Units: A 5-bit enumeration containing the parameter’s real-world units. Use the browse command to learn the attributes of each parameter. 4.4.2.1 PARAMETER UNITS ATTRIBUTE The following table maps Units Attribute values to Parameter units: 2019 Microchip Technology Inc. DS50002938A-page 34... -
Page 35: Parameter Units Attribute
If multiple alarm conditions are unac- knowledged by the user, the ALARM pin will remain high until each individual alarm condition has been acknowledged or resolved. Alarm Bits The bits of the Alarms parameter are described as follows: 2019 Microchip Technology Inc. DS50002938A-page 35... - Page 36 Disciplining is enabled but the digital tuning adjust- Disciplining Range ment needed to discipline the clock is outside the 262144 Warning range of DigitalTuning. The user should issue a latch command when this alarm occurs. 2019 Microchip Technology Inc. DS50002938A-page 36...
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Page 37: Commands
Loads the most recent configuration from flash memory. load Miscellaneous Commands Returns the minimum and maximum measurements for cer- extremes? tain parameters over the life of the unit. Returns health estimates of certain components. health? Resets the CPU. reset 2019 Microchip Technology Inc. DS50002938A-page 37... -
Page 38: Command Usage
{browse,id} matches element N of {browse,name}. Error [!101] (Invalid argument) if what value for the specified parameter does not exist. Examples {browse,id} – Returns all parameter IDs. {browse,id,Alarms} – Returns the numeric id of the Alarms parameter. 2019 Microchip Technology Inc. DS50002938A-page 38... - Page 39 – The name of the component to query. Currently, only the nvram component is supported. Returns The component’s health rating, from 0 to 100 (full health). For example [=100] Error [!101] (Invalid argument) if the component is not supported. Since V1.0 2019 Microchip Technology Inc. DS50002938A-page 39...
- Page 40 None. Returns [=1] on success. [=0] if no stored configuration is available. Since V1.0 {platform?} Description Returns a short string identifying the firmware platform of the device. Arguments None. Returns [=sa5x] Since V1.0 2019 Microchip Technology Inc. DS50002938A-page 40...
- Page 41 Returns a list of all parameter values that changed since the previous upd. This command is useful for collecting telemetry from the device without continuously polling each parameter. Only the values of the parameters that changed will be reported. Arguments None. 2019 Microchip Technology Inc. DS50002938A-page 41...
- Page 42 For example, if the response is [=,513,20000,515,25,779,20] then the PpsWidth, CableDelay, and DisciplineThresholdPps0 parameter val- ues have changed to 20,000 ns, 25 ns, and 20 ns, respectively. Since V1.0 2019 Microchip Technology Inc. DS50002938A-page 42...
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Page 43: Chapter 5. Maintenance And Troubleshooting
You should return the equipment to Microchip only after you have exhausted the troubleshooting procedures described earlier in this chapter, or if Microchip FTS Services and Support has advised you to return the unit. 2019 Microchip Technology Inc. DS50002938A-page 43... - Page 44 Return Material Authorization (RMA) number and item numbers or part numbers clearly marked on the outside of the container to the address given with the RMA. Repaired equipment is returned to you with shipping costs prepaid by Microchip. 2019 Microchip Technology Inc. DS50002938A-page 44...
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Page 45: Appendix A. Principle Of Operation
Photodiode Laser/Micro-TEC Filters/ Microwave Rb Gas Cell Rb Gas Cell Rb Gas Cell Synthesizer Bu ers Cell Heater TCXO TEC Control Cell Heater Control CPU/FPGA FIGURE A-1: Block Diagram. 2019 Microchip Technology Inc. DS50002938A-page 45... - Page 46 MAC-SA5X User’s Guide NOTES: 2019 Microchip Technology Inc. DS50002938A-page 46...
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Page 47: Appendix B. Legacy Command Set (Sa.3Xm)
If an unsupported or improperly formatted command is received, the MAC responds with "?" followed by a carriage return/line feed sequence. Note: The remainder of this document abbreviates “carriage return/line feed” as “[CRLF]”. 2019 Microchip Technology Inc. DS50002938A-page 47... -
Page 48: Legacy Command Index
DDS Frequency Center Current (0.01Hz) = 0 CellHeaterCurrent (ma) = 418 DCSignal (mv) = 1000 Temperature (mDegC) = 55024 Digital Tuning (0.01Hz) = 3 Digital Tuning (pp15) = 3000000 Analog Tuning On/Off = 0 Analog Tuning (mv) = 1450 2019 Microchip Technology Inc. DS50002938A-page 48... - Page 49 DDS center frequency. As the default value of the digital adjustment is zero, this effectively saves the value. Note: This command is redundant with the <FA> command when used on MAC-SA5X because the <FA> command also saves the value to NVRAM. 2019 Microchip Technology Inc. DS50002938A-page 49...
- Page 50 . The range of nnn for the <FHnnn> command is ±20000000. Values outside of that range are clamped. Note: <FE?> and <FH?> return the digital adjustment in pp 10 and pp 10 respectively. They are redundant commands to <FD?> and <FG?>. 2019 Microchip Technology Inc. DS50002938A-page 50...
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Page 51: Appendix C. Reference Designs
TI MAX202 or similar device is recommended (shown in Figure C-3). This sche- matic was implemented on the previous generation evaluation board and is not fea- tured on the current design. 2019 Microchip Technology Inc. DS50002938A-page 51... - Page 52 RS-232 Schematic without USB Converter. 1PPS Input Connection This reference schematic converts a single-ended (3.3V @ 50Ω) 1PPS signal to the differential LVDS format required by the MAC. FIGURE C-4: 1PPS Input Schematic. 2019 Microchip Technology Inc. DS50002938A-page 52...
- Page 53 This reference schematic converts the MAC’s differential 1PPS LVDS output to a sin- gle-ended 3.3V signal and contains a driver circuit capable of driving a 50Ω coaxial cable. FIGURE C-6: 1PPS Output Schematic. 2019 Microchip Technology Inc. DS50002938A-page 53...
- Page 54 MAC-SA5X User’s Guide RF (10 MHz) Output Connection This reference schematic buffers the MAC’s RF output as a 50Ω, 3.3V signal on J2. FIGURE C-7: RF Output to Differential Schematic. 2019 Microchip Technology Inc. DS50002938A-page 54...
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Page 55: Appendix D. Evaluation Kit
• Heat Sink and Thermal Pad for Thermal Conditioning • LED Status Indications for Power, Lock, and Alarm • Insertable Socket Design to Quickly Plug in a MAC without Need for Soldering • Analog Tuning via SMA(f) Connector 2019 Microchip Technology Inc. DS50002938A-page 55... -
Page 56: Physical Description
• Blue boxes highlight the communications LEDs. • A MAC-SA5X may be plugged into the purple box with its J1 connector oriented towards the bottom of the Evaluation board so that it mates with the Evaluation board’s J9 connector. 2019 Microchip Technology Inc. DS50002938A-page 56... -
Page 57: Communications Connections
• Power Status LED illuminates when power is provided to PS1. • Alarm Status LED illuminates when an alarm condition is triggered. • Lock Status LED illuminates when Atomic Lock is achieved. 2019 Microchip Technology Inc. DS50002938A-page 57... -
Page 58: Input Connections
A terminal emulation program may be used to configure and observe the MAC telem- etry by connecting a PC to J1 or J8 of the Evaluation board (see Section 3.1 “Configure the Serial Port”). Once power is supplied to the MAC, it will 2019 Microchip Technology Inc. DS50002938A-page 58... -
Page 59: Troubleshooting
If the LEDs do not illuminate, check the power cable connector and toggle switch for damage. If atomic Lock cannot be achieved, check that the environmental conditions are within product specifications and that the MAC is properly seated on the board. 2019 Microchip Technology Inc. DS50002938A-page 59... - Page 60 MAC-SA5X User’s Guide 2019 Microchip Technology Inc. DS50002938A-page 60...
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Page 61: Appendix E. Software License Agreements
BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 2019 Microchip Technology Inc. DS50002938A-page 61... - Page 62 MAC-SA5X User’s Guide NOTES: 2019 Microchip Technology Inc. DS50002938A-page 62...
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Page 63: Worldwide Sales And Service
New York, NY Tel: 46-31-704-60-40 Tel: 631-435-6000 Sweden - Stockholm San Jose, CA Tel: 46-8-5090-4654 Tel: 408-735-9110 UK - Wokingham Tel: 408-436-4270 Tel: 44-118-921-5800 Canada - Toronto Fax: 44-118-921-5820 Tel: 905-695-1980 Fax: 905-695-2078 2019 Microchip Technology Inc. DS50002938A-page 63 05/14/19...
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