HI-8435 参数Datasheet PDF下载

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HI-8435 参数 Datasheet PDF下载 HI-8435图片预览
型号： HI-8435
PDF下载： 下载PDF文件 查看货源
内容描述： 32信道地面/或打开电源/打开 [32-Channel Ground/Open or Supply/Open]
分类和应用：
文件页数/大小： 21 页 / 220 K
品牌： HOLTIC [ HOLT INTEGRATED CIRCUITS ]
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HI-8435 REGISTER DESCRIPTIONS (cont.) SUPPLY/OPEN THRESHOLD CENTER VALUE AND HYSTERESIS REGISTER: SOCENHYS Read: SPI Op-code 0xBC Write: SPI Op-code 0x3C Reset Value 00 SOHYSSO5HYSSO4HYSSO3HYSO2HYSSO1HYS0 X X DATA BYTE 1 DATA BYTE 0 7 6 5 4 3 2 1 0 MSB LSB [Opcode, DB1, DB0] AL0 AL5 AL4AL3 AL2AL1 SOCVSOCVSOCVSOCVSOCVSOCV X X 7 6 5 4 3 2 1 0 MSB LSB Bit Name R/W Default Description Not Used. DATAWORD 1 7-6 5-0 - R/W 0 0 SOHYS5-0 R/W Supply/Open Hysteresis. For all inputs programmed to be Supply/Open sensors the hysteresis is set by these 6 bits. Hysteresis = 1V x SOHYS value. DATA WORD 0 7-6 5- 0SOCVAL5-0 R/W - R/W 0 0 Not Used. Supply/Open Threshold Center Value. For all inputs programmed to be Supply/Open sensors the center threshold is set by these 6 bits. Center Threshold = 0.5V x SOCVAL. VTHI = Threshold center value + ½ Hysteresis, Max limit = 22V, Min limit = 3V VTLO = Threshold center value - ½ Hysteresis, Max limit = 21V, Min limit = 2V Example: Supply/Open sensor with VTHI = 12V and VTLO = 6V: a) Program SOHYS b) Program SOCVAL Hysteresis = VTHI - VTLO = 12V - 6V = 6V = 0x06 Center Value = (VTHI + VTLO)/2 = (12V + 6V)/2 = 9V since the DAC gain = 0.5V/1code, converting the Center Value voltage to code, the formula reduces to: Center Value (in code value) = VTHI + VTLO = 18 codes = 0x12 c) write0x3C 0x06 0x12 to SPI 0xBC writes to the Supply/Open Threshold and Hysteresis Registers. 0x06 is 6 decimal = 6V Hysteresis. 0x12 is 18 decimal X 0.5V = 9V Center Threshold. VTHI =9V + 3V = 12V VTLO = 9V - 3V= 6V Note: The maximum value for VTHI = 22V and the minimum value for VTLO = 2V.Also VTHI - VTLO >= 1V. TABLE 7. HOLT INTEGRATED CIRCUITS 8

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