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X1240V8 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - Real Time Clock/Calendar with EEPROM - Xicor

भाग संख्या X1240V8
समारोह Real Time Clock/Calendar with EEPROM
मैन्युफैक्चरर्स Xicor 
लोगो Xicor लोगो 
पूर्व दर्शन
1 Page
		
<?=X1240V8?> डेटा पत्रक पीडीएफ

X1240V8 pdf
X1240
PIN CONFIGURATION
X1240
8 pin SOIC
X1 1
X2 2
NC 3
VSS 4
8
7
6
5
VCC
VBack
SCL
SDA
X1240
8 pin TSSOP
VBack
VCC
X1
1
2
3
8 SCL
7 SDA
6 VSS
X2 4 5 NC
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 col-
lector 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.
VBACK
This input provides a backup supply voltage to the
device. VBACK supplies power to the device in the
event the VCC supply fails.
X1, X2
The X1 and X2 pins are the input and output, respec-
tively, of an inverting amplifier that can be configured
for use as an on-chip oscillator. A 32.768kHz quartz
crystal is used. Recommeded crystals are Sieko VT-200
or Epson C-002RX. The crystal supplies a timebase
for a clock/oscillator. The internal clock can be driven
by an external signal on X1, with X2 left unconnected.
Figure 1. Recommended Crystal connection
18pF
43pF
10M
220K
X1
X2
POWER CONTROL OPERATION
The Power control circuit accepts a VCC and a VBACK
input. The power control circuit will switch to VBACK
when VCC < VBACK - 0.2V. It will switch back to VCC
when VCC exceeds VBACK.
Figure 2. Power Control
VBACK
VCC = VBACK -0.2V
VCC
Internal
Voltage
REAL TIME CLOCK OPERATION
The Real Time Clock (RTC) uses an external, 32.768KHz
quartz crystal to maintain an accurate internal repre-
sentation 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 hav-
ing fewer than 31 days and will have a bit that controls
24 hour or AM/PM format. When the X1240 powers up
after the loss of both VCC and VBACK, the clock will not
increment until at least one byte is written to the clock
register.
Reading the Real Time Clock
The RTC is read by initiating a Read command and
specifying the address corresponding to the register of
the Real Time Clock. The RTC Registers can then be
read in a Sequential Read Mode. Since the clock runs
continuously and a read takes a finite amount of time,
there is the possibility that the clock could change dur-
ing the course of a read operation. In this device, the
time is latched by the read command (falling edge of
2

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डाउनलोड[ X1240V8 Datasheet.PDF ]


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अनुशंसा डेटापत्रक

भाग संख्याविवरणविनिर्माण
X1240V8Real Time Clock/Calendar with EEPROMXicor
Xicor
X1240V8IReal Time Clock/Calendar with EEPROMXicor
Xicor


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