STS1TX datasheet(21/70 Pages) STMICROELECTRONICS

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STS1TX

Characteristics

6.2.5

Sensors

Characteristics measured over recommended operating conditions unless otherwise

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

Table 16. Analog temperature sensor characteristics

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

TERR

Error in temperature

Across the temperature range

±2.5

°C

TSLOPE Temperature coefficient

2.5

mV/

°C

VTS-OUT Output voltage level

0.92

TICC

Current consumption

Buffered output (low output

impedance; about 400 Ohm)

600

µA

Not buffered output (high output

impedance; about 100 k

Ω)

µA

Table 17. Battery indicator and low battery detector(1)

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

VBLT

Battery level thresholds

2.1

2.7

VBOT

Brownout threshold

Measured in slow battery

variation (static) conditions

(inaccurate)

1.535

Measured in slow battery

variation (static) conditions

(accurate)

1.684

BOThyst Brownout threshold hysteresis

1. For battery powered equipment, the TX does not transmit at incorrect frequencies under low battery voltage

conditions. It either remains on channel or stops transmitting. The latter can of course be implemented by

using a lock detect and/or by switching off the PA under control of the battery monitor. For testing purposes

this control is enabled/disabled by SPI.

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