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參數(shù)資料
| 型號(hào)： | X1203 |
| 英文描述： | 2-Wire RTC(Real Time Clock)/Calendar/Alarm(實(shí)時(shí)時(shí)鐘/日歷/警報(bào)) |
| 中文描述： | 2線(xiàn)實(shí)時(shí)時(shí)鐘（實(shí)時(shí)時(shí)鐘）/日歷/鬧鐘（實(shí)時(shí)時(shí)鐘/日歷/警報(bào)） |
| 文件頁(yè)數(shù)： | 2/19頁(yè) |
| 文件大?。?/td> | 84K |
| 代理商： | X1203 |
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X1203
2
PIN DESCRIPTIONS
Serial Clock (SCL)
The SCL input is used to clock all data into and out of
the device. The input buffer on this pin is always active
(not gated).
Serial Data (SDA)
SDA is a bidirectional pin used to transfer data into and
out of the device. It has an open drain output and may
be wire ORed with other open drain or open collector
outputs. The input buffer is always active (not gated).
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 2-wire
interface speeds.
V
BACK
This input provides a backup supply voltage to the
device. V
BACK
supplies power to the device in the
event the V
CC
supply fails.
Interrupt Output - IRQ
This is an interrupt signal output. This signal notifies a
host processor that alarm has occured and requests
action. It is an open drain active LOW output.
X1, X2
The X1 and X2 pins are the input and output, respec-
tively, of an inverting amplifier that can accept an
external 32.768KHz sqare wave reference on X1 or
can be configured for use as an on-chip oscillator. A
32.768kHz quartz crystal is used with the on-chip
oscillator. After power up (when both V
fail) the clock is initialized to 12:00 a.m. Saturday Jan 1,
2000. The clock will not advance until at least one byte
is written to the RTC register. Recommended crystals
are Seiko VT-200 or Epson C-002RX. The crystal sup-
plies a timebase for a clock/oscillar, see figure 1.
Using an external timebase, the internal clock is driven
by the external signal on X1, with X2 left unconnected.
CC
and V
BACK
Figure 1. Recommended Crystal connection
POWER CONTROL OPERATION
The Power control circuit accepts a V
input. The power control circuit will switch to V
when V
CC
< V
BACK
- 0.2V. It will switch back to V
when V
CC
exceeds V
BACK
CC
and a V
BACK
BACK
CC
.
Figure 2. Power Control
REAL TIME CLOCK OPERATION
The Real Time Clock (RTC) uses an external 32.768KHz
quartz crystal network or timebase to maintain an
accurate internal representation of the year, month,
day, date, hour, minute, and seconds. The RTC has
leap-year correction and a century byte. The clock will
also correct for months having fewer than 31 days and
will have a bit that controls 24 hour or AM/PM format.
After power up, when both V
clock will not advance unless at least one byte is written
to the RTC register.
CC
and V
BACK
fail, the
X1203
8 pin TSSOP
X1
X2
V
Back
V
CC
IRQ
SCL
SDA
V
SS
1
2
3
4
7
6
5
8
X1203
8 pin SOIC
X1
X2
V
Back
SCL
SDA
V
CC
IRQ
V
SS
1
2
3
4
7
6
5
8
X1
X2
43pF
18pF
220K
10M
V
BACK
V
CC
= V
BACK
-0.2V
Internal
Voltage
V
CC
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| X1203S8I | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:Real-Time Clock |
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