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AS8267BLQS Datasheet(PDF) 2 Page - ams AG |
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AS8267BLQS Datasheet(HTML) 2 Page - ams AG |
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2 / 136 page  Data Sheet AS8267 / AS8268 Revision 1.0, 19-Jun-07 Page 2 of 136 1kByte volatile data memory. The meter system designer also has the option of an additional external EEPROM memory, which is selectable in size from 1kByte to 32kByte (in binary steps). Program and data stored in the on-chip non-volatile Flash memory can be secured by password protection, in addition to an attack counter which ‘locks’ access after 5 unauthorised attacks. An on-chip programmable watchdog timer (WDT) is available to automatically initiate a system reset if a regular ‘hold-off’ signal is not detected. The system timing and real time clock (RTC) has a dedicated external battery supply pin (VDD_BAT), enabling the oscillator and RTC to continue operation during ‘power-down’. The RTC may be digitally calibrated for oscillator frequency accuracy. The on-chip temperature sensor provides the meter designer the option of temperature compensation for any of the measured parameters or functional blocks provided, over the full operating temperature range of the device. The LCD Driver (LCDD) block enables the display of information provided by the microcontroller, directly to the LCD. Two dedicated data register banks are provided to simplify programming, particularly in the case where scrolled display data is required. The programmable multi-purpose I/O pins (MPIO) may be independently configured as inputs or outputs. All the I/O pins are programmable for data direction, pull-up/pull-down resistors and drive strength (4mA/8mA). Typical functions may include LED energy consumption pulse output, energy direction and fault condition indication depending on current 1 or current 2 being active for the energy calculation, push button for display scrolling, mains isolation relay control for prepayment meters, optical interface etc. An on-chip analog ground buffer (ABUF) and voltage reference (VREF) ensures that no external circuitry is required. A power-supply monitor (PSM) provides a reset, when VDD falls below a safe operating threshold. A reset pin (RES_N) is available for external system reset. The AS8267 / AS8268 ICs are available in LQFP64 plastic package. |
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