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R2051S01-E2 Datasheet(PDF) 4 Page - RICOH electronics devices division |
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R2051S01-E2 Datasheet(HTML) 4 Page - RICOH electronics devices division |
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4 / 58 page  R2051 Series 4 PIN DESCRIPTION PIN R2051Kxx (FFP12) R2051Sxx (SSOP16) R2051Txx (TSSOP10G) Symbol Item Description 2 4 3 SCL Serial Clock Line The SCL pin is used to input clock pulses synchronizing the input and output of data to and from the SDA pin. Allows a maximum input voltage of 5.5 volts regardless of supply voltage. 1 5 4 SDA Serial Data Line The SDA pin is used to input or output data intended for writing or reading in synchronization with the SCL pin. Up to 5.5v beyond VDD may be input. This pin functions as an Nch open drain output. 9 10 - INTR Interrupt Output The INTR pin is used to output alarm interrupt (Alarm_W) and alarm interrupt (Alarm_D) and output periodic interrupt signals to the CPU. Disabled at power-on from 0V. Nch. open drain output. 3 3 2 CLKOUT 32kHz Clock Output The CLKOUT pin is used to output 32.768-kHz clock pulses. CMOS output. “H” level is always equal to VCC. 5 16 10 VCC Main Battery input Supply power to the IC. 4 2 1 VSB Power Supply Input for Backup Battery Connect a primary battery for backup. Normally, power is supplied from VCC to the IC. If VCC level is equal or less than –VDET1, power is supplied from this pin. 7 13 8 OSCIN 8 12 7 OSCOUT Oscillation Circuit Input / Output The OSCIN and OSCOUT pins are used to connect the 32.768-kHz quartz crystal unit (with all other oscillation circuit components built into the R2051). 6 15 9 VDD Positive Power Supply Input The VDD pin is connected to the power supply. Connect a capacitor as much as 0.1 µF between VDD and VSS. In the case of using a secondary battery, connecting the secondary battery to this pin is possible. 12 7 - VDCC VCC Power Supply Monitoring Result Output While monitoring VCC Power supply, if the voltage is equal or lower than –VDET1, this output level is “L”. When VDCC becomes “L”, SW1 turns off and SW2 turns on. As a result, power is supplied from VSB pin to the internal real time clock. When VCC is equal to +VDET1 or more, SW1 turns on and SW2 turns off. After t DELAY passed, VDCC output becomes off, or “H”.ch Open-drain output. 10 9 6 CIN Noise Bypass Pin To stabilize the internal reference, connect a capacitor as much as 0.1 µF between this pin and VSS. 11 8 5 VSS Negative Power Supply Input The VSS pin is grounded. - 1,6, 11,14 - NC No Connection |
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