參數(shù)資料
型號(hào)： ISL12022MIBZR5421
廠商： INTERSIL CORP
元件分類： 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取
英文描述： REAL TIME CLOCK, PDSO20
封裝： ROHS COMPLIANT, PLASTIC, MS-013AC, SOIC-20
文件頁(yè)數(shù)： 12/29頁(yè)
文件大?。?/td> 395K
代理商： ISL12022MIBZR5421
ISL12022MR5421
2
FN7576.1
June 4, 2010
Block Diagram
Pin Configuration
ISL12022MR5421
(20 LD SOIC)
TOP VIEW
I2C
INTERFACE
CONTROL
LOGIC
ALARM
FREQUENCY
OUT
RTC
DIVIDER
SDA
BUFFER
CRYSTAL
OSCILLATOR
POR
SWITCH
SCL
BUFFER
SDA
SCL
VDD
VBAT
INTERNAL
SUPPLY
VTRIP
SECONDS
MINUTES
HOURS
DAY OF WEEK
DATE
MONTH
YEAR
USER
SRAM
CONTROL
REGISTERS
GND
REGISTERS
TEMPERATURE
SENSOR
FREQUENCY
CONTROL
IRQ/FOUT
+
-
GND
NC
GND
NC
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
GND
NC
GND
VDD
GND
VBAT
GND
NC
IRQ
/F
OUT
SCL
SDA
Pin Descriptions
PIN
NUMBER
SYMBOL
DESCRIPTION
4, 5, 9, 10,
16, 17
NC
No Connection. Do not connect to a signal or supply voltage.
7VBAT
Backup Supply. This input provides a backup supply voltage to the device. VBAT supplies power to
the device in the event that the VDD supply fails. This pin can be connected to a battery, a
supercapacitor or tied to ground if not used. See the Battery Monitor parameter in the “DC Operating
Characteristics-RTC” table on page 5. This pin should be tied to ground if not used.
11
SDA
Serial Data. SDA is a bi-directional pin used to transfer data into and out of the device. It has an
open drain output and may be OR’ed with other open drain or open collector outputs. The input buffer
is always active (not gated) in normal mode.
An open drain output requires the use of a pull-up resistor. The output circuitry controls the fall time
of the output signal with the use of a slope controlled pull-down. The circuit is designed for 400kHz
I2C interface speeds. It is disabled when the backup power supply on the VBAT pin is activated.
12
SCL
Serial Clock. The SCL input is used to clock all serial data into and out of the device. The input buffer
on this pin is always active (not gated). It is disabled when the backup power supply on the VBAT pin
is activated to minimize power consumption.
ISL12022MR5421
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