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ISL12008 Arkusz danych(PDF) 6 Page - Intersil Corporation |
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ISL12008 Arkusz danych(HTML) 6 Page - Intersil Corporation |
6 / 19 page 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) 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) 1.0 1.5 2.0 2.5 3.0 3.5 -40 -20 0 20406080 TEMPERATURE (°C) 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) 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 |
Podobny numer części - ISL12008 |
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Podobny opis - ISL12008 |
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