RNA52A10MM datasheet(2/11 Pages) RENESAS

2 / 11 page

RNA52A10MM

Rev.4.00

Feb 23, 2007

page 2 of 10

Functional Block Diagram and Typical application Circuit

VREF

1.0V

VDD0

VDD1

VDD2

VDD3

VDD4

Micro-

computer

RESET

RL1

RL2

RS1

RS2

RS3

RS4

GND

VDD

Vi1

Vi2

Vo1

Vo2

Reset circuit 1

Reset circuit 2

Notes: 1. Please refer to the following equations to set up reset-threshold voltages for power supplies VDD1 and VDD2,

and to set up external voltage-dividing resistor pairs RS1 and RS2, and RS3 and RS4.

(1) VDD1 reset-threshold voltage = VREF

× (RS1+RS2)/RS2

(2) VDD2 reset-threshold voltage = VREF

× (RS3+RS4)/RS4

Note that values must be set up within the following range: RS1, RS2, RS3, RS4

≤ 50 kΩ

See the following graph for the relationship between the reference voltage variation and the value selected

for RS1, RS2, RS3 and RS4.

2. For capacitor C1, select a type which has excellent frequency characteristics. For stable operation, place it

between the VDD pin and the GND pin and as close as is possible to the chip.

The value of capacitor C1 must suit the system environment in terms of the quality of the power supply and so

forth.

Reference Voltage Variation vs. Parallel Resistance

-1

0.1

100

1000

Parallel Resistance (RS1//RS2, RS3//RS4) [k

Ω]

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