AMC7832IPAPR datasheet(34/74 Pages) TI2

34 / 74 page

Temperature

Low Threshold

(lower bound)

Temperature

High Threshold

(upper bound)

Temperature

Data

LT-HIGH-ALR Bit

150°C

LT-LOW-ALR Bit

THERM-ALR Bit

ADCn-Lower-Thresh

Value

(lower bound)

ADCn-Upper-Thresh

Value

(upper bound)

LV_ADCn

Conversion Value

(n = 12 to 16)

ADCn-ALR Bit

AMC7832

SLAS836 – MARCH 2014

www.ti.com

8.3.2.4.1

Unipolar Inputs Out-of-Range Alarms

The AMC7832 provides out-of-range detection for the five external unipolar ADC inputs (LV_ADC12 to

LV_ADC16, terminals 41 - 45). 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 – 0x93) define the upper and lower bound thresholds for all five inputs.

Figure 48. Unipolar Inputs Out-of-Range Alarms

8.3.2.4.2

Internal Temperature Sensor Out-of-Range Alarms

The AMC7832 includes high-limit and low-limit detection for the internal temperature sensor. The values in the

LT Upper and Lower Threshold registers (address 0x94 – 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 49. Internal Temperature Out-of-Range Alarms

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