ISL12008IB8Z 查看數據表（PDF） - Renesas Electronics
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ISL12008IB8Z Datasheet PDF : 19 Pages
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ISL12008 I2C Real Time Clock with Battery Backup
Typical Performance Curves Temperature is +25°C, unless otherwise specified.
0.2
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1.8
2.3
2.8
3.3
3.8
4.3
4.8
5.3
VBAT (V)
FIGURE 1. IBAT vs VBAT
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
FIGURE 2. IBAT vs TEMPERATURE AT VBAT = 3V
3.5
VDD = 5V
3.0
2.5
2.0
VDD = 3.3V
1.5
1.0
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
FIGURE 3. IDD1 vs TEMPERATURE
3.5
3.0
2.5
LP MODE OFF
2.0
1.5
LP MODE ON
1.0
0.5
1.8
2.3
2.8
3.3
3.8
4.3
4.8
5.3
VDD (V)
FIGURE 4. IDD1 vs VDD WITH LPMODE ON AND OFF
EQUIVALENT AC OUTPUT LOAD CIRCUIT FOR VDD = 5V
5.0V
SDA
AND
FT/OUT
1533
FOR VOL= 0.4V
AND IOL = 3mA
100pF
FIGURE 5. STANDARD OUTPUT LOAD FOR TESTING THE
DEVICE WITH VDD = 5.0V
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 the
crystal timing accuracy over-temperature either during
FN6690 Rev 1.00
Sep 26, 2008
Page 6 of 19
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