OptConnect ema:Play User Manual page 17

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Table 8
The IO application header (J5) can be used to control, monitor, and interface with various signals and
systems throughout the ema:Play hardware, as well as ema.
Table 9 summarizes the signals relative to J5.
J5 Pin Number
1, 10, 27
2, 3, 4, 5, 6
7
8
9
11
13, 14
15, 16
17, 18, 19, 20
21, 22
23, 24
25, 26
This signal can be used to power external devices that may require
4VMOD the ability to have power removed by the load switch (U6). (4V @
1.25A max)
This signal can be used to request ema to turn ON or OFF. Drive
MODEM_ON_OFF high (max 5.5V) to request ema to turn ON. Drive low to request
ema to turn OFF.
This signal can be used by an external source to set ema's IO voltage
MODEM_IO_VREF
levels (1.8V-5.5V)
Unused Unused
J4 Signal Name
DGND Connect this to the external devices' system Ground/return
PA08, PB07, PB06, PA07 These signals connect directly to the onboard MCU's (U16) GPIO's
PA06 and can be used according to the limitations of U16
This signal can be used by an external device to force a hardware
OB_uP_RESET
reset of the onboard MCU (U16)
This signal can be used by an external device to assert the Data
MOD_DTR
Terminal Ready (DTR) signal for ema
This signal can be used by an external device to input an analog
OB_uP_AIN
voltage (max 3.3V) for reading by the onboard MCU (U16)
This signal can be used by the onboard MCU (U16) to generate
OB_uP_DAC
analog voltage (max 3.3V) for use by an external device
OB_uP_SCL, These signals can be used to connect external i2c devices for use by
OB_uP_SDA the onboard MCU (U16)
EXT_EMA_RX, These signals can be used by an external device to communicate
EXT_EMA_TX directly over the emaLink interface. See section 3.4.
EXT_RTS, EXT_CTS, These signals can be used by an external device to communicate
EXT_RX, EXT_TX directly over the ema Modem UART interface. See section 3.4.
OB_uP_APP_HDR_RX, These signals can be used by an external device to communicate
OB_uP_APP_HDR_TX directly with the onboard MCU (U16)
OB_uP_DBG_RX, These signals can be used by the onboard MCU (U16) to send and
OB_uP_DBG_TX receive debug/console messages over UART.
These signals can be used by the onboard MCU (U16) to interface to
CAN/RX, CAN/TX
a CAN transceiver for communications
© OptConnect Management, LLC 2020. All rights reserved. Revision 1.0
Usage Example
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