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ISL12032IVZ bảng dữ liệu(PDF) 8 Page - Intersil Corporation |
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ISL12032IVZ bảng dữ liệu(HTML) 8 Page - Intersil Corporation |
8 / 26 page 8 FN6618.0 December 14, 2007 General Description The ISL12032 device is a low power real time clock with 50/60 AC input for timing synchronization. It also has an oscillator utilizing an external crystal for timing back-up, clock/calendar registers, intelligent battery back-up switching, battery voltage monitor, brownout indicator, integrated trickle charger for super capacitor, single periodic or polled alarms, POR supervisory function, and up to 4 Event Detect with time stamp. There are 128 bytes of battery-backed user SRAM. The oscillator uses a 50/60 cycle sine wave input, backed by an external, low-cost, 32.768kHz crystal. The real time clock tracks time with separate registers for hours, minutes, and seconds. The calendar registers contain the date, month, year, and day of the week. The calendar is accurate through year 2100, with automatic leap year correction and auto daylight savings correction. The ISL12032’s alarm can be set to any clock/calendar value for a match. Each alarm’s status is available by checking the Status Register. The device also can be configured to provide a hardware interrupt via the IRQ pin. There is a repeat mode for the alarms allowing a periodic interrupt every minute, every hour, every day, etc. 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 ISL12032 devices are specified for VDD = 2.7V to 5.5V and the clock/calendar portion of the device remains fully operational in battery backup mode down to 1.8V (Standby Mode). The VBAT level is monitored and warnings are reported against preselected levels. The first report is registered when the VBAT level falls below 85% of nominal level, the second level is set for 75% of nominal level. Battery levels are stored in the PWRBAT registers. The ISL12032 offers a “Brownout” alarm once the VDD falls below a pre-selected trip level. In the ISL12032, this allows the system microcontroller to save vital information to memory before complete power loss. There are six VDD trip levels for the brownout alarm. The event detection function accepts a normally low logic input, and when triggered will store the time/date information for the event. The first event is stored in the memory until reset; subsequent events are stored on-chip memory and the last 3 events are retained and accessible by performing an indexed register read. 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 device to supply a backup timebase for the real time clock if there is no AC input. The device also can be driven directly from a 32.768kHz source at pin X1, in which case, pin X2 should be left unconnected. No external load capacitors are needed for the X1 and X2 pins. VBAT (Battery Input) This input provides a backup supply voltage to the device. VBAT supplies power to the device in the event that the VDD supply fails. This pin can be connected to a battery, a Super Capacitor or tied to ground if not used. AC (AC Input) The AC input is the main clock input for the real time clock. It can be either 50Hz or 60Hz, sine wave. The preferred amplitude is 2.5VP-P, although amplitudes >0.25VDD are acceptable. An AC coupled (series capacitor) sine wave clock waveform is desired as the AC clock input provides DC biasing. LV (Low Voltage) This pin indicates the VDD supply is below the programmed level. This signal notifies a host processor that the main supply is low and requests action. It is an open drain active LOW output. EVIN (Event Input) The EVIN pin input detects an externally monitored event. When a HIGH signal is present at the EVIN pin, an “event” is detected.This input may be used for various monitoring functions, such as the opening of a detection switch on a chassis or door. The event detection circuit can be user enabled or disabled (see EVIN bit) and provides the option to be operational in battery backup modes (see EVATB bit). When the event detection is disabled, the EVIN pin is gated OFF. See “Functional Pin Descriptions” on page 2 for more details. EVDET (Event Detect Output) The EVDET is an open drain output, which will go low when an event is detected at the EVIN pin. If the event detection function is enabled, the EVDET output will go LOW and stay there until the EVT bit is cleared. FIGURE 2. RECOMMENDED CRYSTAL CONNECTION X1 X2 ISL12032 |
Số phần tương tự - ISL12032IVZ |
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Mô tả tương tự - ISL12032IVZ |
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