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6
FN6690.1
September 26, 2008
General Description
The ISL12008 device is a low power real time clock with
timing and crystal compensation, clock/calendar, power fail
indicator, software alarm, and intelligent battery backup
switching.
The oscillator uses an external, low-cost 32.768kHz crystal.
The real time clock tracks time with separate registers for
hours, minutes, seconds, and sub-seconds. The device has
calendar registers for date, month, year and day of the week.
The calendar is accurate through 2099, with automatic leap
year correction.
The ISL12008's powerful alarm can be set to any
clock/calendar value for a match. For example, every
minute, every Tuesday or at 5:23 AM on March 21. The
alarm status is available by checking the Status Register.
The device also offers a backup power input pin. This VBAT
pin allows the device to be backed up by battery or super
capacitor with automatic switchover from VDD to VBAT. The
entire ISL12008 device is fully operational from 2.7V to 5.5V
and the clock/calendar portion of the device remains fully
operational down to 1.8V in battery mode.
Pin Descriptions
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 ISL12008 to supply a timebase for the real time
clock. Internal compensation circuitry provides high accuracy
over the operating temperature range from -40°C to +85°C.
This oscillator compensation network can be used to calibrate
Typical Performance Curves Temperature is +25°C, unless otherwise specified.
FIGURE 1. IBAT vs VBAT
FIGURE 2. IBAT vs TEMPERATURE AT VBAT = 3V
FIGURE 3. IDD1 vs TEMPERATURE
FIGURE 4. IDD1 vs VDD WITH LPMODE ON AND OFF
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0.2
1.8
2.3
2.8
3.3
3.8
4.3
4.8
5.3
VBAT (V)
I BA
T
(A)
0.50
0.55
0.60
0.65
0.70
0.75
0.80
0.85
0.90
0.95
1.00
-40
-20
0
204060
80
TEMPERATURE (°C)
I BA
T
(A)
1.0
1.5
2.0
2.5
3.0
3.5
-40
-20
0
20406080
TEMPERATURE (°C)
I DD
(A)
VDD = 3.3V
VDD = 5V
0.5
1.0
1.5
2.0
2.5
3.0
3.5
1.82.3
2.8
3.3
3.84.3
4.85.3
VDD (V)
I CC
(
A
)
LP MODE OFF
LP MODE ON
FIGURE 5. STANDARD OUTPUT LOAD FOR TESTING THE
DEVICE WITH VDD = 5.0V
SDA
AND
FT/OUT
1533
Ω
100pF
5.0V
FOR VOL= 0.4V
AND IOL = 3mA
EQUIVALENT AC OUTPUT LOAD CIRCUIT FOR VDD = 5V
ISL12008
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