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X1226 Datasheet(PDF) 4 Page - Intersil Corporation

Part No. X1226
Description  Real Time Clock/Calendar with EEPROM
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

X1226 Datasheet(HTML) 4 Page - Intersil Corporation

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4
FN8098.2
September 15, 2005
DESCRIPTION (continued)
The Real-Time Clock keeps track of time with
separate registers for Hours, Minutes, Seconds. The
Calendar has separate registers for Date, Month, Year
and Day-of-week.
The calendar is correct through
2099, with automatic leap year correction.
The powerful Dual Alarms can be set to any
Clock/Calendar value for a match. For instance, every
minute, every Tuesday, or 5:23 AM on March 21. The
alarms can be polled in the Status Register or provide
a hardware interrupt (IRQ Pin).
There is a repeat
mode for the alarms allowing a periodic interrupt.
The PHZ/IRQ pin may be software selected to provide
a frequency output of 1 Hz, 4096 Hz, or 32,768 Hz.
The device offers a backup power input pin. This
VBACK pin allows the device to be backed up by
battery or SuperCap. The entire X1226 device is fully
operational
from
2.7
to
5.5
volts
and
the
clock/calendar portion of the X1226 device remains
fully operational down to 1.8 volts (Standby Mode).
The X1226 device provides 4K bits of EEPROM with 8
modes of BlockLock™ control. The BlockLock allows a
safe, secure memory for critical user and configuration
data, while allowing a large user storage area.
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 speed.
VBACK
This input provides a backup supply voltage to the
device. VBACK supplies power to the device in the
event the VCC supply fails. This pin can be connected
to a battery, a Supercap or tied to ground if not used.
Programmable Frequency/Interrupt Output – PHZ/IRQ
This is either an output from the internal oscillator or an
interrupt signal output. It is an open drain output.
When used as frequency output, this signal has a
frequency of 32.768kHz, 4096Hz, 1Hz or inactive.
When used as interrupt output, this signal notifies a
host processor that an alarm has occurred and an
action is required. It is an active LOW output.
The control bits for this function are FO1 and FO0 and
are found in address 0011h of the Clock Control Mem-
ory map. See “Programmable Frequency Output
Bits—FO1, FO0” on page 8.
X1, X2
The X1 and X2 pins are the input and output,
respectively, of an inverting amplifier. An external
32.768kHz quartz crystal is used with the X1226 to
supply a timebase for the real time clock. The
recommended crystal is a Citizen CFS206-32.768KDZF.
Internal compensation circuitry is included to form a
complete oscillator circuit. Care should be taken in the
placement of the crystal and the layout of the circuit.
Plenty of ground plane around the device and short
traces to X1 and X2 are highly recommended. See
Application section for more recommendations.
Figure 1. Recommended Crystal connection
NC = No internal connection
X1
X2
VBACK
VCC
PHZ/IRQ
SCL
SDA
VSS
1
2
3
4
7
8
6
5
8-Pin TSSOP
X1226
X1
X2
VBACK
VCC
PHZ/IRQ
SCL
SDA
VSS
1
2
3
4
7
8
6
5
8-Pin SOIC
X1
X2
X1226


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