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Table 2-2: IoT Expansion Card Signal Connections (Continued)
IoT
Signals
I2C
(Pins 22–23)
GPIO_1 (Pin 24)
GPIO_2 (Pin 25)
GPIO_3 (Pin 26)
GPIO_4 (Pin 27)
n_CARD_DETECT
(Pin 31)
n_RESET
(Pin 32)
PCM
(Pins 33–36)
PPS
(Pin 37)
Power
(Pins 1 (5V), 11 (1.8V),
28/29 (3.3V))
Ground (4, 21, 30, 38)
Alternate signal functions (require hardware reconfiguration)
GPIO_4 (Pin 27)
n_RESET
(Pin 32)
PPS
(Pin 37)
PPS
(Pin 37)
Rev 2 Oct.19
CF3 / Other Signal(s)
Signal
Mux
I2C1
Hub
(Pins 1, 66)
GPIO42 (Pin 109)
No
SPI1_SRDY (Pin 44)
No
GPIO7 (Pin 40)
No
GPIO8 (Pin 41)
No
I2C via GPIO
Expander
I/O_8
RESET_IOT0
No
(via Reset circuitry)
PCM
No
(Pins 33–36)
DR_SYNC
No
(Pin 42)
Power
n/a
GPIO36 (from light
No
sensor)
RESET_N (Pin 11)
No
GPIO40 (Pin 94)
No
ADC3 (Pin 108)
No
Purpose: Data transfer (standard mode). Higher speeds possible if
supported by host application.
For details, see
I2C1 on page
Purpose: Customer-defined data communication
For details, see
CF3 GPIOs on page
Purpose: Indicates an IoT card is inserted in the IoT expansion
connector (CN601).
For details, see
GPIO Expander on page
Purpose: Reset the IoT card.
For details, see
Reset Methods on page
Purpose: Digital audio interface
For details, see
Audio (Analog and PCM) on page
Purpose: Clock signal used to manage timing for sensor nodes (or
other devices) that are connected to the expansion card.
The signal is a stratum 1 clock input from the host application,
where the host application operates as a stratum 1 time source
connected to GPS (a stratum 0 source).
Default configuration—Receives three power inputs:
5.0V @ 500 mA
•
3.3V @ 1 A
•
1.8V @ 200 mA
•
For details, see
Power Management on page
Input from light sensor
Purpose: Reset the CF3 module from the IoT card.
Purpose: Customer-defined data communication
For details, see
CF3 GPIOs on page
Purpose: General purpose ADC output to host application (e.g.
indicate when a sensor has triggered)
For details, see
ADC on page
17
Hardware
Notes
23.
20.
22.
36.
19.
37.
20.
19.
41113116
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