Peripherals On Legacy Peripheral Daughterboard; Ldr (Light Dependent Resistor); Temperature Sensor; Table 12. Temperature Sensor Related Solder Bridge - ST STM32G081B-EVAL User Manual

UM2403
8.7
8.7.1
8.7.2
Note:
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Peripherals on legacy peripheral daughterboard

LDR (Light dependent resistor)

The VDD is divided by resistor bridge of LDR VT9ON1 and 8.2 K resistor and connected to
PA1 (COM1_IN+/ADC IN1) as shown
It's possible to compare LDR output with ¼ band gap, 1/2 band gap, 3/4 band gap, band
gap and DAC1 OUT and to connect LDR output to ADC IN1 for AD conversion.

Temperature sensor

A temperature sensor STLM75M2F is connected to the I2C1 bus of the STM32G081RBT6,
and shares same I2C1 bus with EXT I2C connector (on mother board) and DDC on
HDMI_Source connector CN3 (on legacy board).
I2C address of temperature sensor is 0b100100(A0), A0 can be 0 or 1 depends on the
setting of SB7.

Table 12. Temperature sensor related solder bridge

Solder Bridge
I2C address A0 is 0 when SB7 is open.
SB7
(Default setting)
I2C address A0 is 1 when SB7 is closed.
The temperature result measured from STLM75M2F would be a little higher than the
ambient temperature due to the power dissipation of components on the board.
Hardware layout and configuration
Figure 9 on STM32G081B-EVAL Evaluation board.
Figure 9. GP comparator 1
Description
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