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LM81BIMTX-3 Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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LM81BIMTX-3 Datasheet(HTML) 4 Page - National Semiconductor (TI) |
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4 / 33 page  Pin Description (Continued) Pin Name(s) Pin Number Number of Pins Type Description INT 10 1 Digital Output Interrupt active low open-drain output. This output is enabled when Bit 1 in the Configuration Register is set to 1. The default state is disabled. DACOut/NTEST_IN 11 1 Analog Output/Digital Input 0V to +1.25V amplitude 8-bit DAC output. When forced high by an external voltage the NAND Tree Test mode is enabled which provides board-level connectivity testing. Refer to Section 11.0 on NAND Tree testing. RESET 12 1 Digital I/O Master Reset, 5 mA driver (open-drain), active low output with a 20 ms minimum pulse width. Available when enabled via Bit 4 in the Configuration register. It acts as an active low power on RESET input. GND 13 1 GROUND Internally connected to all circuitry. The ground reference for all analog inputs and the DAC output. This pin needs to be connected to a low noise analog ground plane for optimum performance of the DAC output. Vccp2 14 1 Analog Input Analog input for monitoring −12V or Vccp2. Selectable by choosing the appropriate external resistor divider values such that the input to the LM81 is scaled to +2.5V. See Section 4.0. +12Vin 15 1 Analog Input Analog input for monitoring +12V. +5Vin 16 1 Analog Input Analog input for monitoring +5V. +3.3Vin 17 1 Analog Input Analog input for monitoring +3.3V. +2.5Vin 18 1 Analog Input Analog input for monitoring +2.5V. Vccp1 19 1 Analog Input Analog input for monitoring Vccp, a processor voltage that is nominally at +2.5V. VID4-VID0 20-24 5 Digital Inputs Supply Voltage readouts from the Pentium/PRO power supplies that indicate the operating voltage or the processor (e.g. 1.5V to 2.9V). The values are read in the VID/Fan Divisor Register and the VID4 Register. TOTAL PINS 24 www.national.com 4 |
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