AMC7812SPAP datasheet(76/92 Pages) TI

76 / 92 page

AMC7812

SBAS513E – JANUARY 2011 – REVISED SEPTEMBER 2013

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ANALOG INPUT CHANNEL THRESHOLD REGISTERS (Read/Write, Addresses = 5Ah to 61h)

Four analog auxiliary inputs (CH0, CH1, CH2, and CH3) and three temperature sensors (LT, D1, and D2)

implement an out-of-range alarm function. Threshold-High-n and Threshold-Low-n (where n = 0, 1, 2, 3) define

the upper bound and lower bound of the nth analog input range, as shown in Table 27. This window determines

whether the nth input is out-of-range. When the input is outside the window, the corresponding CH-ALR-n bit in

the Status Register is set to '1'.

For normal operation, the value of Threshold-High-n must be greater than the value of Threshold-Low-n;

otherwise, CH-ALR-n is always set to '1' and an alarm is always indicated. Note that when the analog channel is

accessed as single-ended input, its threshold is in a straight binary format. However, when the channel is

accessed as a differential pair, its threshold is in twos complement format.

Table 27. Threshold Coding

INPUT CHANNEL

INPUT TYPE

THRESHOLD STORED IN

FORMAT

Input-0-Threshold-High-Byte

Channel 0

Single-Ended

Straight binary

Input-0-Threshold-Low-Byte

Input-1-Threshold- High-Byte

Channel 1

Single-Ended

Straight binary

Input-1-Threshold- Low-Byte

Input-2-Threshold- High-Byte

Channel 2

Single-Ended

Straight binary

Input-2-Threshold- Low-Byte

Input-3-Threshold- High-Byte

Channel 3

Single-Ended

Straight binary

Input-3-Threshold- Low-Byte

Input-0-Threshold- High-Byte

CH0+/CH1–

Differential

Twos complement

Input-0-Threshold- Low-Byte

Input-2-Threshold- High-Byte

CH2+/CH3–

Differential

Twos complement

Input-2-Threshold- Low-Byte

Input-n-High-Threshold Register (where n = 0, 1, 2, 3) (Read/Write, Default = 0FFFh)

MSB

LSB

BIT 15

BIT 14

BIT 13

BIT 12

BIT 11

BIT 10

BIT 9

BIT 8

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

THRH

Bits[15:12]

Reserved. These bits are '0' when read back. Writing to these bits has no effect.

Bits[11:0]

THRHn: Data bits of the upper-bound threshold of the nth analog input.

Input-n-Low-Threshold Register (where n = 0, 1, 2, 3) (Read/Write, Default = 0000h)

MSB

LSB

BIT 15

BIT 14

BIT 13

BIT 12

BIT 11

BIT 10

BIT 9

BIT 8

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

THRL

Bits[15:12]

Reserved. These bits are '0' when read back. Writing to these bits has no effect.

Bits[11:0]

THRLn: Data bits of the lower-bound threshold of the nth analog input.

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