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LMP91000
EVM User’s Guide
SNAU121-April
2012
2.5.3. Voltage reference
If the on board 2.5V voltage reference fits the requirements of the application, do not accomplish the
following steps.
1. Remove R6 resistor
2. Connect a reference voltage (1.5V to VDD) between VREF test point and GND test point.
2.5.4. I2C bus
The I2C bus requires two 10kohm pull-up resistors (R1, R2); the external microcontroller can be connected to the
SPIO-GPSI16 connector according to the following pin out:
SCL
pin 12 of SPIO-GPSI16
SDA
pin 11 of SPIO-GPSI16
GND
pin 2 of SPIO-GPSI16
Refer to LMP91000’s datasheet for further details on I2C commands and registers.
The footprints of the pull-up resistors (R1, R2) are on the bottom side of the eval board.
2.5.5. Other
Remove the resistor R8 in order to disconnect the ADC’s input from LMP91000’s output.
