STM3210C-EVAL STMicroelectronics, STM3210C-EVAL Datasheet - Page 18

• Manufacturer Part Number: STM3210C-EVAL
• Description: EVAL BOARD FOR STM32F107VCT
• Manufacturer: STMicroelectronics
• Type: MCUr

Specifications of STM3210C-EVAL

• Contents: Fully Assembled Evaluation Board
• Processor To Be Evaluated: STM32F107VCT
• Processor Series: STM32
• Interface Type: RS-232, USB, I2C, JTAG
• Operating Supply Voltage: 5 V
• For Use With/related Products: STM32F107
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-8924

Hardware layout and configuration
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IDD measurement
Figure 4.
The circuit above is implemented on STM3210C-EVAL for IDD measurement.
In Run mode, IDD current is measured using MAX9938FEUK+ (U21) connected to the
1ohm shunt resistor. In this case IDD_CNT_EN remains high during measurement and
JP23 jumper must be set to 2<->3.
In Stop or Standby mode, the operational amplifier MAX9938FEUK+ (U21) is connected on
the 1 Kohm shunt resistor.
To measure a current corresponding to the Stop or Standby modes the procedure is:
1.
2.
3.
4.
5.
6.
In Stop or Standby modes, the 1K resistor is connected when T2 goes off after entering the
Stop or Standby mode. Q13 output of the counter allows connection of the 1K resistor when
the current IDD becomes very low.
Configure ADC to measure voltage on IDD_measurement pin.
Configure PA0 as interrupt input on falling edge.
Enter in Stop or Standby modes with IDD_CNT_EN Low.
LP_WAKEUP falling edge wakeup the MCU after 100 ms.
Start ADC conversion as soon as possible after wakeup in order to measure the
voltage corresponding to Low power mode on 1 uF capacitor.
Reset the counter by programming IDD_CNT_EN High in less than 50 mS after the
wakeup to avoid 1 Kohm to be connected later on VDD_MCU.
STM3210C-EVAL IDD measurement circuit
Doc ID 15082 Rev 3
Figure 5
shows the measurement timing.
UM0600