Техническая Спецификация для STMicroelectronics Multiple-device temperature sensor and RTC demonstration board based on the STM32 STEVAL-IFS017V1 STEVAL-IFS017V1

Doc ID 023106 Rev 1

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There are two power sections in this system:

1.

Power for motherboard.

2. 

Power for temperature sensor daughter cards.

The motherboard input power is 5 V from a USB connection. This 5 V is converted to 3.3 V 
using the LD39080DT33 voltage regulator. The STM32F102xx microcontroller is operated 
at 3.3 V.

Connector CN5 and CN6 are used to configure the supply voltage for the daughter cards. 

 shows the pin connections and their respective voltages generated for daughter 

cards.

This demo board supports different temperature sensors and RTCs present on different 
daughter cards. For digital temperature sensors, the address lines are configured using the 
switches (SW2, SW3, and SW4) present on the motherboard. Logic level is assigned to the 
address line using the address selection switches. 

 shows the position of the switch 

and the respective logic level assigned by that switch.

Short Pin1(5 V) and 

Pin2(VDD_D)

DON’T CARE

5.0 V

Short Pin2(VDD_D) 

and Pin3(VCC_SEL)

Short Pin1 and Pin2 (2.3 V)

2.3 V

Short Pin2(VDD_D) 

and Pin3(VCC_SEL)

Short Pin3 and Pin4 (2.7 V)

2.7 V

Short Pin2(VDD_D) 

and Pin3(VCC_SEL)

Short Pin5 and Pin6 (3.0 V)

3.0 V

Short Pin2(VDD_D) 

and Pin3(VCC_SEL)

Short Pin7 and Pin8 (2.3 V)

3.3 V

Short Pin2(VDD_D) 

and Pin3(VCC_SEL)

Short Pin9 and Pin10 (2.3 V)

3.6 V