RS5C372B-E2-F Просмотр технического описания (PDF) - RICOH Co.,Ltd.

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RS5C372B-E2-F

I2C bus SERIAL INTERFACE REAL-TIME CLOCK ICs

RICOH Co.,Ltd. 

RS5C372A/B

· For those systems that have temperature detection precision of clock function may be increased by correcting

clock error according to temperature fluctuations.

5. Oscillation halt sensing

The oscillation halt sensing function uses a register to store oscillation halt information. This function may be used

to determine if the RS5C372A/B supply power has been booted from 0V and if it has been backed up. This function

is useful for determining if clock data is valid or invalid.

6. Periodic interrupt

˙ RS5C372A

The RS5C372A can output periodic interrupt pulses in addition to alarm function from the INTRA and INTRB pins.

This frequency may be selected from 2Hz (every 0.5 seconds), 1Hz (every second), 1/60Hz (every minute),

1/3600Hz (every hour) and monthly (1st of month).

Output wave form for periodic interrupt may be selected from regular pulse waveform (2Hz and 1Hz) and wave-

forms (every second, every minute, every hour and every month) that are appropriate for CPU level interrupt. Out-

puts may be selected either INTRA or INTRB. The RS5C372A/B has polling function that monitors pin status in the

register.

˙ RS5C372B

The RS5C372B can output periodic interrupt pulses in addition to alarm function from the INTR pin. This frequency

may be selected from 2Hz (every 0.5 seconds), 1Hz (every second), 1/60Hz (every minute), 1/3600Hz (every hour)

and monthly (1st of month).

Output wave form for periodic interrupt may be selected from regular pulse waveform (2Hz and 1Hz) and wave-

forms (every second, every minute, every hour and every month) that are appropriate for CPU level interrupt. Peri-

odic Interrupt outputs from INTR. The RS5C372B has polling function that monitors pin status in the register.

7. 32-kHz clock output

˙ RS5C372A

The RS5C372A may output oscillation frequency from the INTRB pin. This clock output is set for output by default,

which is set to on or off by setting the register.

˙ RS5C372B

The RS5C372B may output oscillation frequency from the 32KOUT pin. This clock output is set for output by

default, which is set to on or off by setting the register. The 32KOUT pin is CMOS push-pull output terminal.

Note

The year-digit counter of RS5C372A/B counts only lower two digits of a year and no counter is supplied for upper two

digits. When you are going to use this product in a system that must cope with “2000 year problem” which shall be

corrected by software.

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