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HI-8435 View Datasheet(PDF) - Holt Integrated Circuits

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HI-8435 Datasheet PDF : 21 Pages
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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
[Opcode, DB1, DB0]
Bit
Name R/W Default Description
XX
SOHYSSO5HYSSO4HYSSO3HYSSO2 HYS1
76543210
MSB
LSB
XX
SOCVSAOLC5VSAOL4CVSAOL3CVSAOL2CVAL1
76543210
MSB
LSB
DATA BYTE 1
DATA BYTE 0
DATA WORD 1
7-6
-
R/W 0
Not Used.
5-0 SOHYS5-0 R/W 0
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
-
R/W 0
Not Used.
5- 0 SOCVAL5-0 R/W 0
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
Hysteresis = VTHI - VTLO = 12V - 6V = 6V = 0x06
b) Program SOCVAL
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) write 0x3C 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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