PT7C43190 Datasheet, PDF (7/32 Pages) Pericom Semiconductor Corporation – Real-time Clock Module

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Functional Description
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1. Overview of Functions
1.1. Clock function
CPU can read or write data including the year (last two digits), month, date, day, hour, minute, and second. Any (two-digit) year
that is a multiple of 4 is treated as a leap year and calculated automatically as such until the year 2099.
1.2. Alarm function
This device has two alarm system (Alarm 1 and Alarm 2) that outputs interrupt signals from INT pin to CPU when the date, day
of the week, hour, minute or second correspond to the setting. Each of them may output interrupt signal separately at a specified
time. The alarm may be selectable between on and off for matching alarm or repeating alarm.
1.3. Programmable square wave output
For PT7C43190, square wave output at pin 1. Six frequencies are selectable: 1, 2, 4, 8, 16, 32768 Hz.
1.4. Interface with CPU
PT7C43190: 3-wire interface.
1.5. Calibration function
With the calibration bits properly set, the accuracy can be improved to better than ±2 ppm at 25°C.
2. Configuration of Data Communication
2.1. Data Communication
After setting the CS pin "H", transmit the 4-bit fixed code "0110", after that, transmit a 3-bit command and 1-bit read /write
command. Next, data is output or input from B7. Regarding details refer to "3-wire Serial Interface".
Fixed Code
Command
Read/Write bit
0
1
1
0
C2 C1 C0 R/W
1-byte data
B7 B6 B5 B4 B3 B2 B1 B0
2015-09-0015
PT0274-7 10/16/15
7