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LM87CIMT Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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LM87CIMT Datasheet(HTML) 3 Page - National Semiconductor (TI) |
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3 / 32 page  Pin Description (Continued) Pin Name(s) Pin Number Number of Pins Type Description GND 8 1 GROUND The system ground pin. 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. V + (+2.8 V to +3.8 V) 9 1 POWER +3.3 V V + power. Bypass with the parallel combination of 10 µF (electrolytic or tantalum) and 0.1 µF (ceramic) bypass capacitors. INT# /ALERT# 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. It has an on-chip 100 k Ω pullup resistor. Alternately used as an active low output to signal SMBus Alert Response Protocol. DACOut/NTEST_IN 11 1 Analog Output/Digital Input 0 V to +2.5 V amplitude 8-bit DAC output. When forced high on power up by an external voltage the NAND Tree Test mode is enabled which provides board-level connectivity 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 also acts as an active low power on RESET input. It has an on-chip 100 k Ω pullup resistor. D1− 13 1 Analog Input Analog input for monitoring the cathode of the first external temperature sensing diode. D1+ 14 1 Analog Input Analog input for monitoring the anode of the first external temperature sensing diode. +12Vin 15 1 Analog Input Analog input for monitoring +12 V. +5Vin 16 1 Analog Input Analog input for monitoring +5 V. Vccp2/D2− 17 1 Analog Input Digitally programmable analog input for monitoring Vccp2 (0 to 3.6 V input range) or the cathode of the second external temperature sensing diode. +2.5Vin/D2+ 18 1 Analog Input Digitally programmable analog input for monitoring +2.5 V or the anode of the second external temperature sensing diode. Vccp1 19 1 Analog Input Analog input (0 to 3.6 V input range) for monitoring Vccp1, the core voltage of processore 1. VID4/IRQ4- VID0/IRQ0 20-24 5 Digital Inputs Digitally programmable dual function digital inputs. Can be programmed to monitor the VID pins of the Pentium/PRO and Pentium II processors, that indicate the operating voltage of the processor, or as interrupt inputs. The values are read in the VID/Fan Divisor Register and the VID4 Register. These inputs have on-chip 100 k Ω pullup resistors. TOTAL PINS 24 # Indicates Active Low (“Not”) www.national.com 3 |
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