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PC87360 Datasheet(PDF) 25 Page - National Semiconductor (TI) |
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PC87360 Datasheet(HTML) 25 Page - National Semiconductor (TI) |
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25 / 168 page  1.0 Signal/Pin Connection and Description (Continued) 25 www.national.com 1.4.13 Strap Configuration 1.4.14 System Wake-Up Control 1.4.15 WATCHDOG Timer (WDT) Signal Pin/s I/O Buffer Type Power Well Description BADDR 101 I INSTRP VDD Base Address. Sampled by the trailing edge of the system reset to determine the base address of the configuration Index-Data register pair. During reset, it is pulled down by internal 30Kohm resistor. If no pull-up resistor is connected, it is sampled low, setting the Index-Data pair at 2Eh-2Fh. Connecting a 10K external pull-up resistor to VDD would make it sample high, setting the Index-Data pair at 4Eh-4Fh. TEST 98 I INSTRP VDD Test. If sampled high on the trailing edge of system reset, this signal forces the device into test mode. This pin is for National Semiconductor use only, and should be left unconnected. Signal Pin/s I/O Buffer Type Power Well Description LED1 LED2 25 26 O O12/12 VSB LED. VSB-powered pins with programmable outputs, each of which can be used to produce a 0, 0.25, 0.5, 1, 4 Hz waveform for LED control. GPIE6-7 58-59 I INTS VSB General-Purpose Input Event GPIOE0-5 23-28 I/O INTS/ OD6,O3/6 VSB General-Purpose I/O Event. VSB-powered pins. PWUREQ 32 O OD6 VSB Power-Up Request. Active (low) level indicates that wake-up event has occurred, and causes the chipset to turn the power supply on, or to exit its current sleep state. The open-drain output must be pulled up to VSB in order to function during power-off. RING 27 I INTS VSB Telephone Line Ring. Detection of a pulse train on the RING pin is a wake-up event that can activate the power-up request (PWUREQ). The pin has a Schmidt-trigger input buffer, powered by VSB. Signal Pin/s I/O Buffer Type Power Well Description WDO 56 O OD6,O3/6 VDD WATCHDOG Out. Low level indicates that the WATCHDOG Timer has reached its time-out period without being retriggered. The output type and an optional pull-up are configurable. |
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