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X5323V14I Datasheet(PDF) 5 Page - Intersil Corporation |
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X5323V14I Datasheet(HTML) 5 Page - Intersil Corporation |
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5 / 20 page  5 FN8131.2 June 30, 2008 Principles of Operation Power-on Reset Application of power to the X5323/X5325 activates a power-on reset circuit. This circuit goes active at about 1V and pulls the RESET/RESET pin active. This signal prevents the system microprocessor from starting to operate with insufficient voltage or prior to stabilization of the oscillator. As long as RESET/RESET pin is active, the device will not respond to any Read/Write instruction. When VCC exceeds the device VTRIP value for 200ms (nominal) the circuit releases RESET/RESET, allowing the processor to begin executing code. Low Voltage Monitoring During operation, the X5323/X5325 monitors the VCC level and asserts RESET/RESET if supply voltage falls below a preset minimum VTRIP. The RESET/RESET signal prevents the microprocessor from operating in a power fail or brown-out condition. The RESET/RESET signal remains active until the voltage drops below 1V. It also remains active until VCC returns and exceeds VTRIP for 200ms. Watchdog Timer The watchdog timer circuit monitors the microprocessor activity by monitoring the WDI input. The microprocessor must toggle the CS/WDI pin periodically to prevent a RESET/RESET signal. The CS/WDI pin must be toggled from HIGH to LOW prior to the expiration of the watchdog time out period. The state of two nonvolatile control bits in the status register determine the watchdog timer period. The microprocessor can change these watchdog bits, or they may be “locked” by tying the WP pin LOW and setting the WPEN bit HIGH. VCC Threshold Reset Procedure The X5323/X5325 has a standard VCC threshold (VTRIP) voltage. This value will not change over normal operating and storage conditions. However, in applications where the standard VTRIP is not exactly right, or for higher precision in the VTRIP value, the X5323/X5325 threshold may be adjusted. Setting the VTRIP Voltage This procedure sets the VTRIP to a higher voltage value. For example, if the current VTRIP is 4.4V and the new VTRIP is 4.6V, this procedure directly makes the change. If the new setting is lower than the current setting, then it is necessary to reset the trip point before setting the new value. To set the new VTRIP voltage, apply the desired VTRIP threshold to the VCC pin and tie the CS/WDI pin and the WP pin HIGH. RESET/RESET and SO pins are left unconnected. Then apply the programming voltage VP to both SCK and SI and pulse CS/WDI LOW then HIGH. Remove VP and the sequence is complete. Resetting the VTRIP Voltage This procedure sets the VTRIP to a “native” voltage level. For example, if the current VTRIP is 4.4V and the VTRIP is reset, the new VTRIP is something less than 1.7V. This procedure must be used to set the voltage to a lower value. To reset the VTRIP voltage, apply a voltage between 2.7V and 5.5V to the VCC pin. Tie the CS/WDI pin, the WP pin, and the SCK pin HIGH. RESET/RESET and SO pins are left unconnected. Then apply the programming voltage VP to the SI pin ONLY and pulse CS/WDI LOW then HIGH. Remove VP and the sequence is complete. SCK SI VP VP CS FIGURE 1. SET VTRIP VOLTAGE SCK SI VCC VP CS FIGURE 2. RESET VTRIP VOLTAGE X5323, X5325 |
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