RX5C348A/B(2003) Просмотр технического описания (PDF) - RICOH Co.,Ltd.

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RX5C348A/B
(Rev.:2003)

4-wire Serial Interface

RICOH Co.,Ltd. 

Rx5C348A/B

Voltage Monitoring Circuit

The supply monitoring circuit is configured to conduct a sampling operation during an interval of 7.8ms per

second to check for a drop in supply voltage below a threshold voltage of 2.1 or 1.6v for the VDSL bit setting of 0

(the default setting) or 1, respectively, in the Control Register 2, thus minimizing supply current requirements as

illustrated in the timing chart below. This circuit suspends a sampling operation once the VDET bit is set to 1 in

the Control Register 2. The supply voltage monitor is useful for back-up battery checking.

VDD

XSTP Internal

initialization

period

1s

(1 to 2sec.)

Sampling timing for

VDD supply voltage

VDET

(D6 in Address Fh)

XSTP←0

VDET←0

7.8ms

2.1v or 1.6v

VDET←0

Rev.2.01

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