103695

103695 - IMU Adapter Board

103695A Circuit Diagram, Parts List, PCB layout     103695A Gerber files

Description

103695 is an adapter board used with the 10369 interface board to connect Analog Devices inertial measurement units (IMU) such as (ADIS-16375, ADIS-16405 and similar to the Elphel Model 353 camera.

Adapter uses two general purpose I/O of the camera FPGA, available on each of the 10369 USB/extension connectors J9..J11. The 103695 board provides 3.3V/5.0V power to the IMU (selectable by on-board resistors) and supports different speed SPI interface to the sensor unit. The device connector (J2) can accommodate a number of Analog Devices units, it should be possible to use the board with connector adapter with other SPI sensors.

Camera interface to the 103695 board is implemented in the FPGA (starting with firmware revision 8.1.0). Up to 28 different 16-bit registers (plus 8 bytes of the timestamp with 1 microsecond resolution) are periodically addressed, read and stored in the camera system memory over the DMA channel. The The logged register addresses are programmed at run time in the FPGA using the device driver.

Connectors

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J1 - to the 10369 board

connector to the 10369 board

Pin	Signal	Notes
1	VP33IN	+3.3V power input
2	MISO	output to the FPGA (multiplexed data/ready from SPI)
3	NMISO	composite input from the FPGA, source of SPI output signals
4	SDA	i2c SDA
5	SCL	i2c SCL
6	GND	ground
7	VP5IN	USB +5V power, not used
8	DM	USB data - , not used
9	DP	USB data + , not used
10	GND	ground

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J2 - to the IMU

connector to the IMU device

Pin	Signal	Notes
1	DIO3	connected to wire pad W7
2	DIO4	connected to wire pad W8
3	SCLK	SPI clock, output
4	IMU_MISO	SPI data, input
5	IMU_MISO	SPI data, output
6	IMU_NCS	SPI CS, active low, output
7	DIO1	connected to wire pad W9
8	IMU_NRESET	IMU reset, active low, output
9	IMU_READY	also DIO2, by deafult set as IMU data ready, input
10	IMUPWR	IMU 3.3VDC/5.0VDC power, output
11	IMUPWR	IMU 3.3VDC/5.0VDC power, output
12	IMUPWR	IMU 3.3VDC/5.0VDC power, output
13	GND	IMU ground, output
14	GND	IMU ground, output
15	GND	IMU ground, output
16	---	not connected
17	---	not connected
18	---	not connected
19	---	not connected
20	XDAC	connected to wire pad W10
21	XADC	connected to wire pad W11
22	---	not connected
23	IMUPWR	IMU 3.3VDC/5.0VDC power, output
24	---	not connected

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J3 - Auxiliary Power

Auxiliary power input

Pin	Signal	Notes
1	VEXT	optional external power to the IMU
2	GND	ground

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A fix done to one of the batches

1. L2 replaced (Fig. A)

Fig.A Top View