S2-LP datasheet(26/90 Pages) STMICROELECTRONICS

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Specifications

S2-LP

26/90

DocID029944 Rev 1

4.11

Battery indicator

Characteristics measured over recommended operating conditions unless otherwise

specified. All typical values are referred to 25 °C temperature, VBAT = 3.0 V.

Table 31: Battery indicator and low battery detector

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Battery level

thresholds #1

2.1

Battery level

thresholds #2

2.3

Battery level

thresholds #3

2.5

Battery level

thresholds #4

2.7

Brownout threshold

Measured in slow battery variation (static)

conditions (inaccurate mode)

1.5

Measured in slow battery variation (static)

conditions (accurate mode)

1.7

Brownout threshold

hysteresis

For battery-powered equipment, the TX does not transmit at a wrong frequency

under low battery voltage conditions. It remains on either channel or stops

transmitting. The latter can of course be realized by using a lock detect and/or by

switching off the PA under control of the battery monitor. For testing reasons this

control is enabled/disabled by SPI.

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