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PDF PT7C4337A Data sheet ( Hoja de datos )
| Número de pieza | PT7C4337A | |
| Descripción | Real-time Clock Module | |
| Fabricantes | Pericom Semiconductor | |
| Logotipo |  |
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PT7C4337A/4337AC
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Real-time Clock Module (I2C Bus)
Features
Description
Using external 32.768kHz quartz crystal for
PT7C4337A
Using internal 32.768kHz quartz crystal for
PT7C4337AC
Supports I2C-Bus's high speed mode (400 kHz)
Includes time (Hour/Minute/Second) and calendar
(Year/Month/Date/Day) counter functions (BCD
code)
Programmable square wave output signal
Two Time-of-Day Alarms
Oscillator Stop Flag
Operating range: 1.8V to 5.5V
Timekeeping range: 1.2V to 1.8V
The PT7C4337A/4337AC serial real-time clock is a
low-power clock/calendar with two programmable time-
of-day alarms and 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 either the
24-hour or 12-hour format with AM/PM indicator.
The device is fully accessible through the serial interface
while VCC is between 1.8V and 5.5V. I2C operation is
not guaranteed below 1.8V. Timekeeping operation is
maintained with VCC as low as 1.2V.
Table 1 shows the basic functions of PT7C4337A/
4337AC. More details are shown in section: overview of
functions.
Table 1. Basic functions of PT7C4337A/4337AC
Item Function
PT7C4337A
Source Crystal(32.768KHz) External crystal
1 Oscillator
Oscillator enable/disable
Oscillator fail detect
2 Time
Time
display
Century bit
12-hour
24-hour
Time count chain enable/disable
3 Interrupt
Alarm interrupt output
4 Programmable square wave output (Hz)
5 Communication 2-wire I2C bus
2
1, 4.096k, 8.192k,
32.768k
PT7C4337AC
Integrated Crystal
2
1, 4.096k, 8.192k,
32.768k
2014-10-0002
PT0480-2 11/03/14
1
1 page  
PT7C4337A/4337AC
Real-time Clock Module (I2C Bus)
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Recommended Layout for Crystal (Only for PT7C4337A)
Note: The crystal, traces and crystal input pins
should be isolated from RF generating signals.
Built-in Capacitors Specifications and Recommended External Capacitors
Parameter
Symbol
Typ
Unit
Build-in capacitors
X1 to GND
X2 to GND
CG
CD
12
12
pF
pF
Recommended External capacitors for
X1 to GND
C1
12
pF
crystal CL=12.5pF
X2 to GND
C2
12
pF
Recommended External capacitors for
X1 to GND
C1
0
pF
crystal CL=6pF
X2 to GND
C2
0
pF
Note: The frequency of crystal can be optimized by external capacitor C1 and C2, for frequency=32.768KHz, C1 and C2 should
meet the equation as below:
Cpar + [(C1+CG)*(C2+CD)]/ [(C1+CG)+(C2+CD)] =CL
Cpar is all parasitical capacitor between X1 and X2.
CL is crystal’s load capacitance.
Crystal Specifications
Parameter
Nominal Frequency
Series Resistance
Load Capacitance
Symbol
fO
ESR
CL
Min
-
-
-
Typ
32.768
-
6/12.5
Max
-
70
-
Unit
kHz
k
pF
2014-10-0002
PT0480-2 11/03/14
5
5 Page 
PT7C4337A/4337AC
Real-time Clock Module (I2C Bus)
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A2F
A1F
Read /
Write
Read
Alarm 2 Flag.
Data Description
0 The time do not match the alarm 2 registers.
Default
Indicates that the time matched the alarm 1 registers. This flag can be used to generate an interrupt on
either INTA or SQW/INTB depending on the status of the INTCN bit. If the INTCN = 0 and A2F = 1
1 (and A2IE = 1), the INTA pin goes low. If the INTCN = 1 and A2F = 1 (and A2IE = 1), the
SQW/INTB pin goes low. A2F is cleared when written to logic 0. Attempting to write to logic 1 leaves
the value unchanged.
Time Counter
Time digit display (in BCD code):
Second digits: Range from 00 to 59 and carried to minute digits when incremented from 59 to 00.
Minute digits: Range from 00 to 59 and carried to hour digits when incremented from 59 to 00.
Hour digits: See description on the /12, 24 bit. Carried to day and day-of-the-week digits when incremented from 11 p.m. to
12 a.m. or 23 to 00.
Addr.
Description D7 D6 D5 D4 D3 D2 D1 D0
(hex)
00 Seconds
(default)
0
S40 S20 S10
S8
S4
S2
S1
00000000
01 Minutes
(default)
0
M40 M20 M10
M8
M4
M2
M1
00000000
02 Hours
(default)
0 12, /24 H20 or P,/A H10 H8 H4 H2 H1
00000000
Note: Any registered imaginary time should be replaced with correct time, otherwise it will cause the clock counter malfunction.
12, /24 bit
This bit is used to select between 12-hour clock system and 24-hour clock system.
12, /24
Data
Description
Read / Write
0 24-hour system
1 12-hour system
2014-10-0002
PT0480-2 11/03/14
11
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet PT7C4337A.PDF ] | |
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