PT7C43190 Datasheet, PDF (2/32 Pages) Pericom Semiconductor Corporation – Real-time Clock Module

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Pin Description
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Pin
No.
Pin
Name
Type
Description
Output for Interrupt Signal. This pin outputs a signal of interrupt, or a clock pulse. By using the status
1
INT
O
register 2, users can select either of: alarm 1
interrupt, alarm 2 interrupt, output of user-set frequency, per-minute edge interrupt, minute-periodical
interrupt 1, minute-periodical interrupt 2, or 32.768 kHz output. This pin has NCH open drain output.
2
XOUT
O
Oscillator Circuit Output. Together with X1, 32.768kHz crystal is connected between them. When
32.768kHz external input, X2 must be float.
3 XIN
I
Oscillator Circuit Input. Together with X1, 32.768kHz crystal is connected between them. Or external
clock input.
4 VSS P Negative power supply pin. Connects to GND.
5
CS
I
Chip select input pin. This pin is to input chip select, has a pull-down resistor. Communication is
available when this pin is in "H". If not using communication, set this pin "L" or open.
Serial clock input pin. This pin is to input a clock pulse for serial interface. When the CS pin is in "H",
6 SCK
I the SIO pin inputs / outputs data by synchronizing with the clock pulse. When the CS pin is in "L" or
open, the SCK pin does not accept inputting a clock pulse.
Serial Data I/O pin. This pin is a data input / output pin of serial interface. When the CS pin is in "H",
the SIO pin inputs / outputs data by synchronizing with a clock pulse from the SCK pin. The status is in
7 SIO I/O "High-Z" when the CS pin is in "L" or open, so that the chip does not transmit data. Setting the CS pin to
"H" from "L" or open, this SIO pin goes in the input status so that it receives the command data. This pin
has CMOS input and NCH open drain output.
8 VDD P Positive power supply pin. Connect this VDD pin with a positive power supply.
Block Diagram
XIN
XOUT
Oscillator
Divider,
Timing generator
INT register 1
INT controller 1
Clock correction register
Status register 1
Status register 2
Free register
VDD
VSS
Low power supply
voltage detector
Power-on
detection circuit
Constant-voltage
circuit
Comparator 1
Real-time data register
Second Minute
Hour
Day of
Week
Day
Month
Year
Comparator 2
INT register 2
INT controller 2
INT register 2
PT7C43190
Serial
interface
INT
SIO
SCK
CS
2015-09-0015
PT0274-7 10/16/15
2