TMP1827 datasheet(26/68 Pages) TI

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by the host and updates the temperature result register when continuous conversion mode is enabled. The

device also performs the alert threshold check and sets the flags and alert pin, if configured accordingly. When

in continuous conversion mode, the CONVERTTEMP function has no effect on the temperature conversion

request. The application can at any time change the rate of conversion or put the device back into one-shot

conversion mode, and this takes effect only after the current conversion is complete.

Active conversion time

Conversion interval

(tCONV)

Conversion interval

Start of conversion

(tACT)

Averaging

Figure 8-16. Continuous Conversion Mode

If due to any reason, the VDD supply fails without the device going through a brown out, causing the device

to move to bus powered mode of operation, the conversion mode automatically reverts to the setting in the

configuration EEPROM.

8.4.2 Alert Function

As described earlier, the built-in alert function can be used by the host to check if the temperature has crossed a

certain threshold. The alert status bits are available in both bus powered and VDD powered mode. The alert pin

is available only in VDD powered mode.

If the device is in VDD powered mode and IO2/ALERT is configured to function as an IO2/ALERT pin, then the

pin shall be driven active low when the threshold crossing occurs. The pin is open-drain, and therefore requires

a pullup resistor. The IO2/ALERT pin deassertion is based on the setting of the ALERT_MODE setting in the

device configuration-1 register.

8.4.2.1 Alert Mode

The device operates in alert mode, when the ALERT_MODE is set as '0b'. In the alert mode of operation, the

alert status flag and IO2/ALERT pin are asserted when the last temperature conversion is either higher than the

temperature alert high limit or when it is lower than the temperature alert low limit register.

TMP1827

SBOSA15 – SEPTEMBER 2022

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TMP1827 Datasheet(PDF) 26 Page - Texas Instruments