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CAT1161WI-28-GT2 데이터시트(PDF) 5 Page - Catalyst Semiconductor |
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CAT1161WI-28-GT2 데이터시트(HTML) 5 Page - Catalyst Semiconductor |
5 / 14 page CAT1161, CAT1162 © 2007 Catalyst Semiconductor, Inc. 5 Doc. No. 3002 Rev. F Characteristics subject to change without notice PIN DESCRIPTION WP: WRITE PROTECT If the pin is tied to VCC the entire memory array becomes Write Protected (READ only). When the pin is tied to GND or left floating normal read/write operations are allowed to the device. RESET/RESET ¯¯¯¯¯¯: RESET I/O (RESET CAT1026 Only) These are open drain pins and can be used as reset trigger inputs. By forcing a reset condition on the pins the device will initiate and maintain a reset condition. The RESET pin must be connected through a pull- down resistor, and the RESET ¯¯¯¯¯¯ pin must be connected through a pull-up resistor. SDA: SERIAL DATA ADDRESS The bidirectional serial data/address pin is used to transfer all data into and out of the device. The SDA pin is an open drain output and can be wire-ORed with other open drain or open collector outputs. If there is no transition on the SDA for more than 1.6 seconds, the watchdog timer times out. SCL: SERIAL CLOCK Serial clock input. DEVICE OPERATION Reset Controller Description The CAT1161/2 precision RESET controller ensures correct system operation during brownout and power up/down conditions. It is configured with open drain RESET outputs. During power-up, the RESET outputs remain active until VCC reaches the VTH threshold and will continue driving the outputs for approximately 200ms (tPURST) after reaching VTH. After the tPURST timeout interval, the device will cease to drive the reset outputs. At this point the reset outputs will be pulled up or down by their respective pull up/down resistors. During power-down, the RESET outputs will be active when VCC falls below VTH. The RESET ¯¯¯¯¯¯ outputs will be valid so long as VCC is >1.0V (VRVALID). The RESET pins are I/Os; therefore, the CAT1161/2 can act as a signal conditioning circuit for an externally applied manual reset. The inputs are edge triggered; that is, the RESET input in the CAT1161/2 will initiate a reset timeout after detecting a low to high transition and the RESET ¯¯¯¯¯¯ input will initiate a reset timeout after detecting a high to low transition. Watchdog Timer The Watchdog Timer provides an independent protection for microcontrollers. During a system failure, the CAT1161 will respond with a reset signal after a time-out interval of 1.6 seconds for a lack of activity. The CAT1161 is designed with the Watchdog Timer feature on the SDA input. If the microcontroller does not toggle the SDA input pin within 1.6 seconds, the Watchdog Timer times out. This will generate a reset condition on reset outputs. The Watchdog Timer is cleared by any transition on SDA. As long as the reset signal is asserted, the Watchdog Timer will not count and will stay cleared. The CAT1162 does not have a Watchdog. Figure 1. RESET Output Timing GLITCH t VCC PURST t PURST t RPD t RVALID V V TH RESE T RESE T RPD t |
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