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PT7C4337AWE Datasheet(PDF) 8 Page - Pericom Semiconductor Corporation

Part # PT7C4337AWE
Description  Real-time Clock Module
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Manufacturer  PERICOM [Pericom Semiconductor Corporation]
Direct Link  http://www.pericom.com
Logo PERICOM - Pericom Semiconductor Corporation

PT7C4337AWE Datasheet(HTML) 8 Page - Pericom Semiconductor Corporation

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2014-10-0002
PT0480-2
11/03/14
8
PT7C4337A/4337AC
Real-time Clock Module (I
2C Bus)
Function Description
Overview of Functions
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 2100. On a power-on reset (POR),
the time and date are set to 00:00:00 01/01/00 (hh:mm:ss DD/MM/YY) and the Day register is set to 01.
Alarm function
This device has two alarm system (Alarm 1 and Alarm 2) that outputs interrupt signals from INTA or INTB 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 is be selectable between on and off for matching alarm or repeating alarm.
Programmable square wave output
A square wave output enable bit controls square wave output at pin 7. Frequencies are selectable: 1, 4.096k, 8.192k, 32.768k Hz.
Interface with CPU
Data is read and written via the I
2C bus interface using two signal lines: SCL (clock) and SDA (data).
Since the output of the I/O pin SDA is open drain, a pull-up resistor should be used on the circuit board if the CPU output I/O is
also open drain.
The SCL's maximum clock frequency is 400 kHz, which supports the I
2C bus's high-speed mode.
Oscillator fail detect
When oscillator fail, PT7C4337A OSF bit will be set.
Oscillator enable/disable
Oscillator and time count chain can be enabled or disabled at the same time by /ETIME bit.
Registers
Allocation of registers
Addr.
(hex)
*1
Function
Register definition
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
00
Seconds (00-59)
0
S40
S20
S10
S8
S4
S2
S1
01
Minutes (00-59)
0
M40
M20
M10
M8
M4
M2
M1
02
Hours (00-23 / 01-12)
0
12, /24
H20 or
P, /A
H10
H8
H4
H2
H1
03
Days of the week (01-07)
0
0
0
0
0
W4
W2
W1
04
Dates (01-31)
0
0
D20
D10
D8
D4
D2
D1
05
Months (01-12)
Century
0
0
MO10
MO8
MO4
MO2
MO1
06
Years (00-99)
Y80
Y40
Y20
Y10
Y8
Y4
Y2
Y1
07
Alarm 1: Seconds
A1M1
*2
S40
S20
S10
S8
S4
S2
S1


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