PT7C4311 Datasheet, PDF (1/16 Pages) Pericom Semiconductor Corporation – Real-time Clock Module

PT7C4311
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Real-time Clock Module (I²C Bus)
Features
Description
 Support I²C-Bus (High speed mode 400kHz)
The PT7C4311 serial real-time clock is a low-power
 Includes time (Hour/Minute/Second) and calendar
(Century/Year/Month/Date/Day) counter functions
 Year 2000 compliant
 Automatic switch-over and deselect circuitry
 Time keeping voltage: 1.2V to 5.5V
 Software clock calibration
 56 bytes of general purpose RAM
 Ultra-low battery supply current of 0.3A
 Low operating current of 70A
 Battery or super cap back-up
 Operating temperature: -40°C to 85°C
clock/calendar with a programmable square-wave output.
Address and data are transferred serially via a 2-wire
bidirectional bus. The clock/calendar provides seconds,
minutes, hours, day, date, month, and year information.
The date at the end of the month is automatically
adjusted for months with fewer than 31 days, including
corrections for leap year. The clock operates in the 24-
hour format indicator.
Table 1 shows the basic functions of PT7C4311. More
details are shown in section: overview of functions.
Pin Configuration
 Automatic leap year compensation
 Special software programmable output
Pin Description
Pin no.
Pin
Type
Description
1
X1
I ^{Oscillator Circuit Input. Together with X1, 32.768kHz crystal is connected between them. Or}
external clock input.
2
X2
O _{Oscillator Circuit Output. Together with X1, 32.768kHz crystal is connected between them.}
3
VBAT
P ^{Battery Supply Voltage. When VCC>VSO1, VCC will power the IC. While VCC<VSO1, VBAT}
will power the IC.
4
GND
P Ground.
5
SDA
I/O ^{Serial Data Input/Output. SDA is the input/output pin for the 2-wire serial interface. The SDA}
pin is open-drain output and requires an external pull-up resistor.
6
SCL
I _{Serial Clock Input. SCL is used to synchronize data movement on the I}²_{C serial interface.}
Frequency Test / Output Driver. Open drain. 512Hz output when Frequency Test is selected.
7
FT/OUT O
Output DC level by register selection. Frequency Test is prior.
8
VCC
P ^{Supply Voltage. When VCC>VSO1, VCC will power the IC. While VCC<VSO1, VBAT will power}
the IC.
Note: 1. V_SO: Battery Back-up Switchover Voltage
2015-06-0002
PT0322-8
06/16/15
1