PT7C4307WEX Pericom Semiconductor, PT7C4307WEX Datasheet - Page 4

• Manufacturer Part Number: PT7C4307WEX
• Description: IC REAL TIME CLK/CALENDAR 8-SOIC
• Manufacturer: Pericom Semiconductor
• Type: Clock/Calendarr

Specifications of PT7C4307WEX

• Memory Size: 56B
• Time Format: Binary
• Date Format: Binary
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: PT7C4307WEXTR

(hex)
08~3F RAM
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Function Description
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.
Programmable square wave output
A square wave output enable bit controls square wave output
at pin 7. 4 frequencies are selectable: 1, 4.096k, 8.192k,
32.768k Hz.
Interface with CPU
Data is read and written via the I
signal lines: SCL (clock) and SDA (data).
Registers
Allocation of registers
Caution points:
*1. PT7C4307 uses 6 bits for address. That is if write data to 41H, the data will be written to 01H address register.
*2. Oscillator Enable bit. When this bit is set to 1, oscillator is stopped but time count chain is still active.
*3. Control register was used to select SQW/OUT pin output square wave with one of 4 kinds of frequency or DC level.
*4. Control SQW/OUT pin output DC level when square wave is disabled.
*5. Square wave outputs enable at SQW/OUT pin.
*6. Square wave output frequency select.
*7. PT7C4307 has 56×8 static RAM for customer use. It is volatile RAM.
*8. All bits marked with "0" are read-only bits. Their value when read is always "0". All bits marked with "-" are customer using
space.
PT0206(08/09)
Addr.
00
01
02
03
04
05
06
07
*1
Seconds (00-59)
Minutes (00-59)
Hours (00-23 / 01-12)
Days of the week (01-07)
Dates (01-31)
Months (01-12)
Years (00-99)
Control
*7
*3
Function
2
C bus interface using two
/EOSC
OUT
Bit 7
Y80
0
0
0
0
0
-
*4
*2
12, /24
Bit 6
M40
Y40
S40
0
0
0
0
-
H20 or
P, /A
Bit 5
M20
D20
Y20
S20
0
0
0
4
-
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
Oscillator enable/disable
Oscillator can be enabled or disabled by /EOSC bit. But time
count chain does not shut down when the bit is logic 1.
RAM
56×8 nonvolatile RAM are available for customer use.
SQWE
Register definition
MO10
Bit 4
M10
H10
D10
Y10
S10
0
-
Real-time Clock Module (I
*5
2
C bus's high-speed mode.
MO8
Bit 3
M8
H8
Y8
D8
S8
0
0
-
MO4
Bit 2
M4
W4
H4
D4
Y4
S4
0
-
RS1
MO2
Bit 1
M2
W2
H2
D2
Y2
S2
Data Sheet
-
*6
PT7C4307
2
C Bus)
RS0
MO1
Bit 0
M1
W1
H1
D1
Y1
S1
Ver: 3
-
*6