1194 datasheet(8/50 Pages) TI

8 / 50 page

CC2550

Preliminary Data Sheet (rev. 1.1)

SWRS039

Page 8 of 51

Analog temperature sensor

The characteristics of the analog temperature sensor are listed in Table 8 below. Note that it is

necessary to write 0xBF to the PTEST register to use the analog temperature sensor in the IDLE

state.

The values in the table are simulated results and will be updated in later versions of the data sheet. Minimum / maximum

values are valid over entire supply voltage range. Typical values are for 3.0V supply voltage.

Parameter

Min

Typ

Max

Unit

Condition/Note

Output voltage at –40

°C

0.638

0.648

0.706

Output voltage at 0

°C

0.733

0.743

0.793

Output voltage at +40

°C

0.828

0.840

0.891

Output voltage at +80

°C

0.924

0.939

0.992

Output voltage at +120

°C

1.022

1.039

1.093

Temperature coefficient

2.35

2.45

2.46

mV/

°C

Fitted from –20

°C to +80°C

Absolute error in calculated

temperature

–14

–8

+14

°C

From –20

°C to +80°C when assuming best fit for

absolute accuracy: 0.763V at 0

°C and 2.44mV / °C

Error in calculated

temperature, calibrated

–2

°C

From –20

°C to +80°C when using 2.44mV / °C,

after 1-point calibration at room temperature

Settling time after enabling

TBD

µs

Current consumption

increase when enabled

0.3

Table 8: Analog Temperature Sensor Parameters

10 DC Characteristics

The DC Characteristics of

CC2550 are listed in Table 9 below.

Tc = 25

°C if nothing else stated.

Digital Inputs/Outputs

Min

Max

Unit

Condition

Logic "0" input voltage

0.7

Logic "1" input voltage

VDD-0.7

VDD

Logic "0" output voltage

0.5

For up to 4mA output current

Logic "1" output voltage

VDD-0.3

VDD

For up to 4mA output current

Logic "0" input current

N/A

–1

µA

Input equals 0V

Logic "1" input current

N/A

µA

Input equals VDD

Table 9: DC Characteristics

11 Power On Reset

When the power supply complies with the requirements in Table 10 below, proper Power-On-

Reset functionality is guaranteed. Otherwise, the chip should be assumed to have unknown state

until transmitting an SRES strobe over the SPI interface. It is recommended to transmit an SRES

strobe after turning power on in any case. See section 23.1 on page 23 for a description of the

recommended start up sequence after turning power on.

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