®
X45620
Data Sheet July 29, 2005 FN8250.0
Dual Voltage Monitor with Integrated System Battery Switch and EEPROM
FEATURES • Dual voltage monitoring • Active low reset outputs • Two standard reset threshold voltages —Factory programmable threshold • Lowline Output — zero delayed POR • Reset signal valid to VCC = 1V • System battery switch-over circuitry • Selectable watchdog timer —(0.15s, 0.4s, 0.8s, off) • 256Kbits of EEPROM • Built-in inadvertent write protection —Power-up/power-down protect.
Dual Voltage Monitor
®
X45620
Data Sheet July 29, 2005 FN8250.0
Dual Voltage Monitor with Integrated System Battery Switch and EEPROM
FEATURES • Dual voltage monitoring • Active low reset outputs • Two standard reset threshold voltages —Factory programmable threshold • Lowline Output — zero delayed POR • Reset signal valid to VCC = 1V • System battery switch-over circuitry • Selectable watchdog timer —(0.15s, 0.4s, 0.8s, off) • 256Kbits of EEPROM • Built-in inadvertent write protection —Power-up/power-down protection circuitry —Protect 0, 1/4, 1/2 or all of EEPROM array with programmable Block Lock™ protection —In circuit programmable ROM mode • Minimize EEPROM programming time —64 byte page write mode —Self-timed write cycle —5ms write cycle time (typical) • 400kHz 2-wire Interface BLOCK DIAGRAM
• • • •
2.7V to 5.5V power supply operation Available package — 20-lead TSSOP Dual supervisor Battery switch and output
DESCRIPTION The Intersil X45620 combines power-on reset control, battery switch circuit, watchdog timer, supply voltage supervision, secondary voltage supervision, block lock protect and serial EEPROM in one package. This combination lowers system cost, reduces board space requirements, and increases reliability. Applying power to the device activates the power-on reset circuit which holds RESET active for a period of time. This allows the power supply and oscillator to stabilize before the processor can execute code. A system battery switch circuit compares VCC (V1MON) with VBATT .