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PDF PT7C43190 Data sheet ( Hoja de datos )
| Número de pieza | PT7C43190 | |
| Descripción | Real-time Clock Module | |
| Fabricantes | Pericom Semiconductor | |
| Logotipo |  |
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PT7C43190
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Real-time Clock Module
Features
Low current consumption: 0.3µA typ. (VDD=3.0V,
TA = 25°C)
Wide operating voltage range: 1.35 to 5.5 V
Minimum time keeping operation voltage: 1.25 V
Built-in clock adjustment function
Built-in free user register
3-wire (micro wire) CPU interface
Built-in alarm interrupter
Built-in flag generator at power down or power on
Auto calendar up to the year 2099, automatic leap
year calculation function
Built-in constant voltage circuit
Built-in 32 kHz crystal oscillator circuit
Package: SOIC-8L, TSSOP-8L, and TDFN2x3-8L
Description
The PT7C43190 is a CMOS 3-wire real-time clock IC,
which operates with the very low current consumption
and in the wide range of operation voltage. The
operation voltage is 1.35 V to 5.5 V so that the RTC can
be used for various power supplies from main supply to
backup battery. In the system which operates with a
backup battery, the included free registers can be used as
the function for user’s backup memory. Users always
can take back the information in the registers which is
stored before power-off the main power supply, after the
voltage is restored.
The IC has the function to correct advance / delay of the
clock data speed, in the wide range, which is caused by
the oscillation circuit’s frequency deviation. Correcting
according to the temperature change by combining this
function and a temperature sensor, it is possible to make
a high precise clock function which is not affected by
the ambient temperature.
Function Table
Item Function
1 Oscillator Source
Crystal*
2 Time
Time
display
12-hour
24-hour
Interrup Alarm interrupt pin output
3
t Timer interrupt output
Programmable square wave output
4
(Hz)
Commu 3-wire bus
5
nication Burst mode
IC test mode
6 Control Power-on detector
Power supply voltage
detector
7 Clock calibration
80 Free register access
PT7C43190
2
1Hz,2Hz,4Hz
8Hz,16Hz
32kHz
Applications
Mobile game device
Digital still camera
Digital video camera
Electronic power meter
DVD recorder
TV, VCR
Mobile phone, PHS
Pin Configuration
PT7C43190
1 INT
VDD 8
2 XOUT
SIO 7
3 XIN
SCK 6
4 VSS
CS 5
SOIC-8
TSSOP-8
DFN2*3
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AC Electrical Characteristics
Measure conditions
Input pulse voltage
Input pulse rise/fall time
Output determination voltage
Output load
VIH = 0.8 ×VDD, VIL = 0.2 ×VDD
20ns
VOH = 0.8 ×VDD, VOL = 0.2 ×VDD
80pF + pull-up resistance 10kΩ
Symbol
Parameter
VDD = 1.35 to 3.0 V (VDD = 3.0 V)
Min.
Typ.
Max.
VDD = 1.35 to 5.5 V (VDD = 5.5 V)
Min.
Typ.
Max.
Unit
tSCK Clock pulse width
5
- 250000 1
-
250000
μs
tDS Setup before CS rise
1-
- 0.2 -
- μs
tCSH Hold time after CS rise 1 -
- 0.2 -
- μs
tISU Input setup time
1-
- 0.2 -
- μs
tIHO Input data hold time
1-
- 0.2 -
- μs
tACC Output definition time *1
-
-
3.5
--
- μs
tCSS Setup before CS fall
1-
- 0.2 -
- μs
tDH Hold time after CS fall 1 -
- 0.2 -
- μs
tR, tF Input rise/fall time
- - 0.1 - - 0.05 μs
*1. Since the output format of the SIO pin is Nch open-drain output, output data definition time is determined by the values of the
load resistance (RL) and load capacity (CL) outside the IC. Therefore, use this value only as a reference value.
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B2: SC3, B3: SC2
These are 2-bit SRAM type registers that can be freely set by users.
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B4: 32kE, B5: INT1AE, B6: INT1ME, B7: INT1FE
These bits are used to select the output mode for the INT pin. Below Table shows how to select the mode. To use alarm
1 interrupt, access the INT register 1 after setting the alarm 1 interrupt mode.
Table: Output Modes for INT Pin
*1. Don't care (both of 0 and 1 are acceptable).
3.4. INT Register 1 and INT Register 2
The INT register 1 is to set up the output of user-set frequency, or to set up alarm 1 interrupt. The INT register 2 is for setting
alarm 2 interrupt. Users are able to switch the output mode by using the status register 2. If selecting to use the output mode for
alarm interrupt by status register 2; this register works as the alarm-time data register. In the INT register 1, if selecting the output
of user-set frequency by status register 2; this register works as the data register to set the frequency for clock output. From the
INT pin, a clock pulse and alarm interrupt are output, according to the or-condition that these two registers have.
a. Alarm interrupt
Users can set the alarm time (the data of day of the week, hour, minute) by using the INT1 and INT2 registers which are 3-byte
data registers. The configuration of register is as well as the data register of day of the week, hour, minute, in the real-time data
register; is expressed by the BCD code. Do not set a nonexistent day. Users are necessary to set up the alarm-time data according
to the 12 / 24 hour mode that they set by using the status register 1.
INT Register 1 and INT Register 2 (Alarm-Time Data)
The INT register 1 has A1WE, A1HE, and A1mE at B0 in each byte. It is possible to make data valid; the data of day of the week,
hour, minute which are in the corresponded byte; by setting these bits to "1". This is as well in A2WE, A2HE, and A2mE in the
INT register 2.
Setting example: alarm time "7:00 pm" in the INT register 1
(1) 12-hour mode (status register 1 B6 = 0)
Set up 7:00 PM
Data written to INT register 1
2015-09-0015
PT0274-7 10/16/15
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11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet PT7C43190.PDF ] | |
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