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ISL12025IBZ bảng dữ liệu(PDF) 8 Page - Intersil Corporation |
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ISL12025IBZ bảng dữ liệu(HTML) 8 Page - Intersil Corporation |
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8 / 27 page  8 FN6371.1 October 18, 2006 Description The ISL12025 device is a Real-Time Clock with clock/calendar, two polled alarms with integrated 512x8 EEPROM configured in 16 Bytes per page format, oscillator compensation, CPU Supervisor (Power-on Reset, Low Voltage Sensing and Watchdog Timer) and battery backup switch. The oscillator uses an external, low-cost 32.768kHz crystal. All compensation and trim components are integrated on the chip. This eliminates several external discrete components and a trim capacitor, saving board area and component cost. 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 64-bit unique ID is a random numbers programmed, verified and Locked at the factory and it is only accessible for reading and cannot be altered by the customer. The 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. There is a repeat mode for the alarms allowing a periodic interrupt. The ISL12025 device integrates CPU Supervisory functions (POR, WDT) and Battery Switch. There is Power-On-Reset (RESET) output with 250ms delay from power-on. It will also assert RESET when VDD goes below the specified threshold. The Vtrip threshold is selectable via VTS2/VTS1/VTS0 registers to five (5) preselected levels. There is WatchDog Timer (WDT) with 3 selectable time-out periods (0.25s, 0.75s and 1.75s) and disabled setting. The WatchDog Timer activates the RESET pin when it expires. The device offers a backup power input pin. This VBAT pin allows the device to be backed up by battery or SuperCap. The entire ISL12025 device is fully operational from 2.7 to 5.5V and the clock/calendar portion of the ISL12025 device remains fully operational down to 1.8V (Standby Power Mode). The ISL12025 device provides 4k bits of EEPROM with eight 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). The pull-up resistor on this pin must use the same voltage source as VDD. 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). This open drain output requires the use of a pull-up resistor. The pull-up resistor on this pin must use the same voltage source as VDD. 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 I2C interface speed. VBAT This input provides a backup supply voltage to the device. VBAT supplies power to the device in the event the VDD supply fails. This pin can be connected to a battery, a SuperCap or tied to ground if not used. RESET The RESET signal output can be used to notify a host processor that the watchdog timer has expired or the VDD voltage supply has dipped below the VRESET threshold. It is an open drain, active LOW output. Recommended value for the pull-up resistor is 10k Ω. If unused it can be tied to ground. 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 ISL12025 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 manufacturing or with an external temperature sensor and microcontroller for active compensation. X2 is intended to drive a crystal only, and should not drive any external circuit (Figure 11). NO EXTERNAL COMPENSATION RESISTORS OR CAPACITORS ARE NEEDED OR ARE RECOMMENDED TO BE CONNECTED TO THE X1 AND X2 PINS. Real-Time Clock Operation The Real-Time Clock (RTC) uses an external 32.768kHz quartz crystal to maintain an accurate internal representation of the second, minute, hour, day, date, month, and year. The RTC has leap-year correction. The clock also corrects for months having fewer than 31 days and has a bit that controls X1 X2 FIGURE 11. RECOMMENDED CRYSTAL CONNECTION ISL12025 |
Số phần tương tự - ISL12025IBZ |
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Mô tả tương tự - ISL12025IBZ |
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