AMC7836IPAPR datasheet(35/91 Pages) TI2

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Temperature

Low Threshold

(lower bound)

Temperature

High Threshold

(upper bound)

Temperature

Data

LT-HIGH-ALR Bit

LT-LOW-ALR Bit

THERM-ALR Bit

150°C

ADCn-Lower-

Threshold Value

(lower bound)

ADCn-Upper-

Threshold Value

(upper bound)

ADCn-ALR

Bit

LV_ADCn

Conversion Value

(n = 16 to 20)

AMC7836

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SLAS986D – NOVEMBER 2014 – REVISED FEBRUARY 2018

Product Folder Links: AMC7836

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7.3.2.4.1

Unipolar Inputs Out-of-Range Alarms

The AMC7836 device provides out-of-range detection for the five external unipolar ADC inputs (LV_ADC16

through LV_ADC20, pins 35 through 39). Figure 55 shows the out-of-range detection block. When the

measurement is out-of-range, the corresponding alarm bit in the alarm status 0 register (address 0x70) is set to 1

to flag the out-of-range condition. The values in the ADC upper and lower Threshold registers (address 0x80

through 0x93) define the upper and lower bound thresholds for all five inputs.

Figure 55. Unipolar Inputs Out-of-Range Alarms

7.3.2.4.2

Unipolar Inputs Out-of-Range Alarms

The AMC7836 includes high-limit and low-limit detection for the internal temperature sensor. Figure 56 shows the

temperature detection block. The values in the LT upper and lower threshold registers (address 0x94 through

0x97) set the limits for the temperature sensor. The temperature sensor detector can issue either a high-alarm

(LT-HIGH-ALR bit) or a low-alarm (LT-LOW-ALR bit) in the alarm status 1 register (address 0x71) depending on

whether the high or low thresholds were exceeded. To implement single, upper-bound threshold detection for the

temperature sensor, the host processor can set the upper-bound threshold to the desired value and the lower-

bound threshold to the default value. For lower-bound threshold detection, the host processor can set the lower-

bound threshold to the desired value and the upper-bound threshold to the default value.

In addition to the programmable threshold alarms the temperature sensor detection circuit also includes a die

thermal-alarm flag which continuously monitors the die temperature. When the die temperatures exceeds 150

˚C

the die thermal alarm flag (THERM-ALR bit) in the alarm status 1 register (address 0x71) is set. The internal

temperature sensor must be enabled for this alarm to be functional.

Figure 56. Internal Temperature Out-of-Range Alarms

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