PT7C4337WEX Pericom Semiconductor, PT7C4337WEX Datasheet - Page 5

• Manufacturer Part Number: PT7C4337WEX
• Description: IC REAL TIME CLK/CALENDAR 8-SOIC
• Manufacturer: Pericom Semiconductor
• Type: Clock/Calendar/Alarmr

Specifications of PT7C4337WEX

• Time Format: Binary
• Date Format: Binary
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 1.8 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
• Memory Size: -
• Other names: PT7C4337WEXTR

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Control and status register
Oscillator related bits
•
Enable oscillator and time count chain bit.
•
Oscillator Stop Flag.
A logic 1 in this bit indicates that the oscillator either is stopped or was stopped for some period of time and may be used to judge
the validity of the clock and calendar data. This bit is set to logic 1 anytime that the oscillator stops. The following are examples
of conditions that can cause the OSF bit to be set:
This bit remains at logic 1 until written to logic 0.
Square wave frequency selection bits
•
Square wave Rate Select. These bits control the frequency of the square-wave output when the square wave has been enabled.
PT0205(08/09)
Addr.
(hex)
0E
0F
1) The first time power is applied.
2) The voltage present on VCC is insufficient to support oscillation.
3) The /ETIME bit is turned off.
4) External influences on the crystal (e.g., noise, leakage, etc.).
Read / Write
Read / Write
/ETIME
OSF
RS2, RS1
RS2, RS1
/ETIME
Description
(default)
(default)
Control
Status
Data
Data
00
01
10
11
0
1
/ETIME
OSF
Enable oscillator and time count chain.
Disable oscillator and time count chain.
1
4.096k
8.192k
32.768k
D7
0
1
D6
0
0
0
0
D5
0
0
0
0
5
SQW output freq. (Hz)
RS2
D4
1
0
0
Description
Real-time Clock Module (I
RS1
D3
1
0
0
INTCN
D2
0
0
0
Undefined Undefined
A2IE
A2F
D1
0
Data Sheet
PT7C4337
2
C Bus)
Default
A1IE
A1F
Default
D0
Ver: 4
0