PT7C4372A 반도체 회로 부품 판매점
Real-time Clock Module
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 Pericom Semiconductor |
PT7C4372A/4372C
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Real-time Clock Module (I2C Bus)
Product Features
• External quartz oscillator 32.000kHz and 32.768kHz
selectable.
• Supports I2C-Bus's high speed mode (400 kHz)
• Includes time (Hour/Minute/Second) and calendar
(Year/Month/Date/Day) counter functions (BCD
code)
• Select between 12-hr and 24-hr clock display
• Auto calculation of leap years until 2099
• Built-in high-precision clock precision control logic
• Interrupt generation function (cycle time range: 1
month to 0.5 seconds, includes interrupt flags and
interrupt stop function)
• Alarm functions (Alarm_A: Day/Hour/Min)
• 32-kHz clock output (/INTB output)
• Oscillation stop detection function (used to determine
presence of internal data)
• Wide Time keeping voltage range: 1.3 V to 6 V
• Wide interface voltage range: 1.8 V to 6 V
• Low current consumption: 0.4 µA/3.0 V (Typ.)
Product Description
PT7C4372A/C are I2C bus interface-compliant real-time
clocks that have been adjusted for high precision. In
addition to providing a function for generating six types
of interrupts, a dual alarm function, an oscillation stop
detection function (used to determine presence of valid
internal data at power-on), they includes a digital clock
precision adjustment function that can be used to set
various levels of precision.
Since the internal oscillation circuit is driven at a
constant voltage, 32-kHz clock output is stable and free
of voltage fluctuation effects.
Table 1 shows the diverse functions of the two RTC
circuits. More details are shown in section Overview of
Functions.
Table 1. Diverse functions of RTC circuits
Item
Function
1 Clock
2 Clock adjustment
3 Period interrupt
4 Alarm
5 Oscillation detect
6 32-kHz clock output
7 I2C bus interface with CPU
8 Crystal
PT7C4372A/4372C
Unit 3.051ppm for 32.768kHz crystal;
3.125ppm for 32.000kHz crystal
Output from /INTA and /INTB
/INTA: Alarm_A; /INTB: Alarm_B
via /INTB enabled by register
External, 32.768kHz or 32.000kHz selectable
12-07-0001
PT0150-8 07/04/12
1
PT7C4372A/4372C
Real-time Clock Module (I2C Bus)
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Pin Assignment
PT7C4372A/C
1 INTB
Vcc 8
2 SCL OSCIN 7
3 SDA OSCOUT 6
4 GND
INTA 5
8 pin TSSOP
8 pin SOIC
Pin Description
Pin No
1
2
3
4
Pin
Name
/INTB
Type
Description
O Interrupt B (Open Drain). It outputs alarm interrupts and periodic interrupts.
SCL
SDA
GND
I
Serial Clock Line. It is for I2C communication. Data input and output across SDA pin is
synchronized with this clock. Up to 6V beyond Vcc may be input.
Serial Data Line (Open Drain output). This line is for transferring I2C bus format data.
I/O When input, up to 6V beyond VCC may be used. When output, it is an open drain output
pin.
P Ground
5 /INTA O Interrupt A (Open Drain). It outputs alarm interrupts and periodic interrupts.
6
OSCOUT
O
Oscillator Circuit Output. Together with OSCIN, an crystal oscillator is connected
between them.
7
OSCIN
I Oscillator Circuit Input. See OSCOUT pin description.
8 Vcc P Power
12-07-0001
PT0150-8 07/04/12
2
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( pericom )
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관련 데이터시트
PT7C4372A
Real-time Clock Module - Pericom Semiconductor
PT7C4372C
Real-time Clock Module - Pericom Semiconductor