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40430B Datasheet(PDF) 1 Page - Xicor Inc. |
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40430B Datasheet(HTML) 1 Page - Xicor Inc. |
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1 / 24 page  REV 1.2.3 11/28/00 Characteristics subject to change without notice. 1 of 24 www.xicor.com Preliminary Information 4kbit EEPROM X40430/X40431 Triple Voltage Monitor with Integrated CPU Supervisor FEATURES • Triple voltage detection and reset assertion —Three standard reset threshold settings (4.6V/2.9V/1.7V, 4.4V/2.6V/1.7V, 2.9V/1.7V/2.4V) —Adjust low voltage reset threshold voltages using special programming sequence —Reset signal valid to VCC = 1V —Monitor three voltages or detect power fail • Fault detection register • Selectable power on reset timeout • Selectable watchdog timer interval • Debounced manual reset input • Low power CMOS —30µA typical standby current, watchdog on —10µA typical standby current, watchdog off • 4Kbits of EEPROM —16 byte page write mode —Self-timed write cycle —5ms write cycle time (typical) • Built-in inadvertent write protection —Power-up/power-down protection circuitry —Block lock protect 0, 1/4, 1/2, all of EEPROM • 400kHz I2C interface • 2.4V to 5.5V power supply operation • Available packages —14-lead SOIC, TSSOP DESCRIPTION The X40430/31 combines power-on reset control, watchdog timer, supply voltage supervision, secondary and third voltage supervision, manual reset, and Block Lock™ protect serial EEPROM in one package. This combination lowers system cost, reduces board space requirements, and increases reliability. Applying voltage to VCC activates the power on reset circuit which holds RESET/RESET active for a period of time. This allows the power supply and system oscillator to stabilize before the processor can execute code. Low VCC detection circuitry protects the user’s system from low voltage conditions, resetting the system when VCC falls below the minimum VTRIP1 point. RESET/ RESET is active until VCC returns to proper operating level and stabilizes. A second and third voltage monitor circuit tracks the unregulated supply to provide a power fail warning or monitors different power supply voltage. Three common low voltage combinations are available, however, Xicor’s unique circuits allows the threshold for either voltage monitor to be repro- grammed to meet special needs or to fine-tune the threshold for applications requiring higher precision. BLOCK DIAGRAM V3FAIL V2FAIL WDO MR LOWLINE RESET RESET X40430 X40431 + - V3 Monitor Logic V2 Monitor Logic VTRIP2 Fault Detection Register Status Register EEPROM Array Data Register Command Decode Test & Control Logic Power on, Manual Reset Low Voltage Reset Generation VCC Monitor Logic V3MON V2MON SDA WP SCL VCC (V1MON) + - VTRIP3 + - VTRIP1 Watchdog and Reset Logic |
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