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HI-8436 Datasheet(PDF) 3 Page - Holt Integrated Circuits |
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HI-8436 Datasheet(HTML) 3 Page - Holt Integrated Circuits |
3 / 21 page HOLT INTEGRATED CIRCUITS 3 PIN FUNCTION DESCRIPTION VLOGIC Supply 3.3V Power Supply for both sensors and logic. VWET<0-3> Supply Optional inputs to supply relay wetting current to sense lines in GND/Open operation. Each of the 4 banks of 8 inputs has a VWETn pin. 50K to GND. Ω SENSE<31:0> Discrete Input 4 banks of 8 discrete inputs programmable through the SPI to be either GND/Open or Supply/Open. The type of input is programmed by bank, PSEN<3:0> bits. “0” makes the bank GND/Open sensors, “1” makes the bank SUPPLY/Open sensors The status of the inputs SENSE<31:0> are stored in SO<31:0> See SPI section for programming and reading sensors. GND Supply 0V Ground for Sensor and Logic. SCK Digital Input SPI Clock. nCS Digital Input SPI Chip Select, Active Low, internal 30K pull-up. Ω SI Digital Input SPI serial data input, internal 30K pull-down. Ω SO Digital Output SPI serial data output. nMR Digital Input Master Reset, Active Low, internal 30K pull-up. Ω HI-8436 PIN DESCRIPTIONS OP Code R/W # Data Bytes DESCRIPTION 0x02 W 1 Write Control Register 0x04 W 1 Write Program Sense Banks Register, PSEN<3:0>, to program SENSE Inputs 0x3A W 2 Write GND/Open Threshold Center Value and Hysteresis 0x3C W 2 Write Supply/Open Threshold Center Value and Hysteresis 0x1E W 1 Write Test Mode Data Register 0x82 R 1 Read Control Register 0x84 R 1 Read Program Sense Banks Register, to read programmed bank type 0xBA R 2 Read GND/Open Threshold Center Value and Hysteresis 0xBC R 2 Read Supply/Open Threshold Center Value and Hysteresis 0x9E R 1 Read Test Mode Data Register 0x90 R 1 Read Bank 0, SOUT Register, SO<7:0>, status of SENSE<7:0> Inputs 0x92 R 1 Read Bank 1, SOUT Register, SO<15:8>, status of SENSE<15:8> Inputs 0x94 R 1 Read Bank 2, SOUT Register, SO<23:16>, status of SENSE<23:16> Inputs 0x96 R 1 Read Bank 3, SOUT Register, SO<31:24>, status of SENSE<31:24> Inputs 0xF8 R 4 Read All Banks, SOUT Register, SO<31:0>, status of SENSE<31:0> Inputs SPI COMMANDS Table 2. Table 1. |
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