STM32100B-EVAL STMicroelectronics, STM32100B-EVAL Datasheet - Page 12

• Manufacturer Part Number: STM32100B-EVAL
• Description: MCU, MPU & DSP Development Tools STM32 ARM Value Line Eval Board
• Manufacturer: STMicroelectronics

Specifications of STM32100B-EVAL

• Processor To Be Evaluated: STM32F100VB
• Data Bus Width: 32 bit
• Interface Type: RS-232, USB, I2C, SPI, USART
• Operating Supply Voltage: 3.3 V
• Silicon Manufacturer: ST Micro
• Core Architecture: ARM
• Core Sub-architecture: Cortex - M3
• Silicon Core Number: STM32
• Silicon Family Name: STM32F1xx
• Kit Contents: Board
• Features: IrDA Transceiver,
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Hardware layout and configuration
2.15
Figure 4.
2.15.1
2.15.2
2.15.3
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IDD measurement
For IDD measurement the circuit below is implemented on the STM32100B-EVAL.
STM32100B-EVAL IDD measurement circuit
Run mode
In Run mode, IDD current is measured using MAX9938FEUK+ (U6) connected to the 1Ω
shunt resistor (R71). In this case IDD_CNT_EN remains high during measurement and a
jumper must be connected between pins 2 and 3 of JP8.
Low power mode
In low power modes (Stop or Standby), the operational amplifier MAX9938FEUK+ (U6) is
connected to the 1KΩ shunt resistor (R72), controlled by the analogue switch STT5PF20V
(T2). In this case the counter 74HC4060 (U9) enabled by IDD_CNT_EN manages the
measurement timing according to
Standby or Stop IDD measurement procedure
To measure a current corresponding to the low power mode the procedure is:
1.
2.
3.
4.
5.
6.
Configure ADC to measure voltage on IDD_measurement pin.
Configure PA0 as wakeup pin.
Enter in Low Power mode after configuring IDD_CNT_EN Low as output low level
(PC13 if JP12 is closed, or PE14 if JP12 is open or on MB871 rev A).
LP_WAKEUP rising edge wakeup the MCU after around 150 ms.
Start ADC conversion as soon as possible after wakeup in order to measure the
voltage corresponding to Low Power mode on capacitor C41.
Reset the counter by programming IDD_CNT_EN High in less than 70 ms after the
wakeup to avoid 1 KΩ being connected later on VDD_MCU.
Doc ID 16533 Rev 2
Figure
5.
UM0841