UM1524 datasheet(14/35 Pages) STMICROELECTRONICS

14 / 35 page

Hardware details

UM1524

14/35

Doc ID 022901 Rev 1

5.7

Battery management section

Two batteries are used in the circuit.

5.7.1

Coin cell BT1

BT1 CR2032 (3 V, 225 mAh) is the microcontroller power source in halt mode to keep RTC

running.

5.7.2

Rechargeable battery BT2

BT2 VL2330 (3 V, 50 mAh) for pushbutton and IRDA operation when mains power is off.

●

Rechargeable battery acts as power source for microcontroller section when

pushbutton is pressed during mains power-off.

●

Rechargeable battery is charged based on trickle charging mode during mains power

on.

5.7.3

Small signal Schottky diode D11, D12, D13, D14, D5

Diodes (D11, D12, D13, D14, D5) BAT30KFILM (SOD - 523) based circuit is used to select

the power source for the microcontroller.

5.7.4

Switch SW3

Switch SW3 is the pushbutton switch. SW3 is used to control LCD display modes.

When mains power is on, on pressing the pushbutton, the LCD display is executed as per

the pushbutton run mode.

When mains power is off, on pressing the pushbutton, the LCD display is executed as per

the pushbutton low-power mode.

5.8

IRDA section

5.8.1

IRDA transceiver U6

The IRDA transceiver TFDU6300 is used for IRDA communication.

5.8.2

Jumper J6

Using jumper J6, IRDA transmit and receive pins allow the testing of the IRDA section using

the SerialIO GUI.

For more details, refer to Section 6.6.2: SerialIO GUI.

Table 2.

Pin jumper headers

Jumper

Pin1

Pin 2

PC3_IRDA_Tx

IRDA transmit pin

PC2_IRDA_Rx IRDA receive pin

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