M62254FP Просмотр технического описания (PDF) - Renesas Electronics

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M62254FP

Standard Battery Charger Controller

Renesas Electronics 

M62254FP

Table 8 A/D Reference Voltage Select

D3

D2

D1

D0

0

0

0

0

0

0

0

1

0

0

1

0

0

0

1

1

0

1

0

0

0

1

0

1

0

1

1

0

0

1

1

1

1

0

0

0

1

0

0

1

1

0

1

0

1

0

1

1

1

1

0

0

Note: 0.4 V is selected at RESET.

Note: All outputs will be OFF at RESET.

Function Block Descriptions

(1) A/D converter input

State

Select 0 V

Select 0.4 V

Select 0.8 V

Select 1.2 V

Select 1.6 V

Select 2.0 V

Select 2.4 V

Select 2.8 V

Select 3.2 V

Select 3.6 V

Select 4.0 V

Select 4.4 V

Select 4.8 V

4.8 V

Voltage regulator

reference voltage

0.4 V

3

+

−

REF

1

*

Note: Connect few 1000 pF capacitor to stabilize the reference voltage.

Select the desire reference voltage to be detected by serial data from the MCU.

The input voltage level of IN1 to IN4 will be magnified 4 times using selected reference voltage as a center. This

magnified data will be return to the A/D input port of the MCU. As result, accuracy of the A/D converter of the

MCU will be increased by 2-bit.

(2) +5 V voltage regulator

IDD

Q1

+5 V

VCC

VB

VDD

Since it is capable of driving external PNP Tr. base up to 20 mA, it can supply current of IDD MAX = 20 mA × Q1hFE.

Also, since this is low I/O type power source, it can operate VCC MIN = VCC – VDD = 0.1 V.

REJ03F0244-0200 Rev.2.00 Jun 16, 2008

Page 7 of 11

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