UM1054 STMICROELECTRONICS | Alldatasheet

Document overview

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Technical content

Datasheet sections

  • 1 STC3105 overview
  • 2 Demonstration board description
  • 3 Demonstration board layout
  • 4 Demonstration board connections
  • 5 Ordering information
  • 6 Revision history

designed for the STC3105 battery monitor IC. Figure 1. STEVAL-ISB013V1 demonstration board

1 STC3105 overview

OCV (Open Circuit Voltage) measurement should be made for SOC correction.

  • Accurate battery voltage measurement
  • Coulomb counter to keep track of the battery's SOC
  • Internal 32.768 kHz time base
  • Low-battery alarm output with programmable SOC and voltage thresholds
  • Relaxation timer to track the load condition (user programmable load current threshold)
  • I2C interface for battery monitoring and device control Performance criteria of the device are:
  • 0.5% battery voltage accuracy
  • 1% Coulomb counter accuracy using an external sensing resistor
  • Low power consumption: 100 µA in active operating conditions, 50 µA in power saving operating conditions, 2 µA in standby mode and 1 µA in power-down mode The device is packaged in a TDFN8, 3 mm x 2 mm x 0.75 mm (pitch 0.65 mm) (as used in the demonstration board).

Figure 2. Typical application diagram for the STC3105

2 Demonstration board description

Figure 3. Demonstration board schematic

  1. Pull-up resistors are not mounted on the board. The us er must either mount them on the board to pull up to

Table 1. Bill of materials (option for onboard pull-up to VCC). (option for onboard pull-up to VCC). (option for onboard pull-up to VCC).

3 Demonstration board layout

  • Board dimensions: 23 mm x 18 mm
  • 2-layer PCB
  • Thickness of PCB: 1.5 mm
  • FR4 material
  • Thickness of copper: 35 µm

Figure 4. Top view of demonstration board

Figure 5. Bottom view of demonstration board

4 Demonstration board connections

with a digital controller as shown in Figure 6. Figure 6. Demonstration board connections with battery and microcontroller

  1. The ALM, SDA, and SCL pins are pulled up to VCC through 4.7 k Ω resistors. In order to pull up these pins

to external I/O voltage, the onboard pull-up resistors should be removed.

5 Ordering information

The STEVAL-ISB013V1 demonstration board can be ordered online at www.st.com (order code STEVAL-ISB013V1).

6 Revision history

Table 2. Document revision history 05-Dec-2011 1 Initial release.