NL865B1 HW Design Guide
1VV0301450 Rev. 1
Page
46
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72
2017-11-20
5.6.2.
Using a GPIO as OUTPUT
The GPIO pads, when used as outputs, can drive 1.8V CMOS digital devices or
compatible hardware. When set as outputs, the pads have a push-pull output and
therefore the pull-up resistor may be omitted.
I2C Port
The NL865B1 supports a dedicated port for I2C communication
I2C speed is limited to 10KHz.
The following table lists the available I2C signals on the NL865B1:
PAD
Signal
I/O
Default
State
NOTE
6
I2C_SDA
I/O
Pull Up
44
I2C_SCL
I/O
Pull Up
Please refer to the AT command user guide for more information.
SIM Interface
The NL865B1 supports a standard SIM card interface with the below exceptions:
•
1.8V I/O only (3V SIM is not supported).
•
SIM PIN (SIM lock) feature is not supported.
•
SIM power OFF during PSM is an expected behavior
For more info on SIM implementation please refer to the related User Guide (SIM Holder
Design Guides, 80000NT10001a).
5.8.1.
SIMIN Detection
PIN 29 is used as SIM DETECT input.
As long as SIMIN is not pulled low by the application board the module will use the
internal eSIM.
For using an external SIM the user must assert SIMIN low
NL865B1 modules ordered without eSIM support will always use the external SIM
regardless of the SIMIN state
NL865B1 modules ordered without eSIM support, can use pin 29 as GPIO_05
