CC2550_13 Datasheet, PDF (8/61 Pages) Texas Instruments – Low-Cost Low-Power 2.4 GHz RF Transmitter

CC2550
4.5 Analog Temperature Sensor
The characteristics of the analog temperature sensor at 3.0 V supply voltage 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.
Parameter
Min Typ Max Unit Condition/Note
Output voltage at –40°C
Output voltage at 0°C
Output voltage at +40°C
Output voltage at +80°C
Temperature coefficient
Error in calculated
temperature, calibrated
Current consumption
increase when enabled
0.660
V
0.755
V
0.859
V
0.958
V
2.54
mV/°C Fitted from –20°C to +80°C
-2 ^*
0
2^*
°C
From –20°C to +80°C when using 2.54 mV / °C,
after 1-point calibration at room temperature
* _{The indicated minimum and maximum error with 1-}
point calibration is based on simulated values for
typical process parameters
0.3
mA
Table 8: Analog Temperature Sensor Parameters
4.6 DC Characteristics
Tc = 25°C if nothing else stated.
Digital Inputs/Outputs
Logic "0" input voltage
Logic "1" input voltage
Logic "0" output voltage
Logic "1" output voltage
Logic "0" input current
Logic "1" input current
Min
0
VDD-0.7
0
VDD-0.3
NA
NA
Max
0.7
VDD
0.5
VDD
-50
50
Unit Condition/Note
V
V
V For up to 4 mA output current
V For up to 4 mA output current
nA Input equals 0 V
nA Input equals VDD
Table 9: DC Characteristics
4.7 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. See Section 16.1 on page 25 for further
details.
Parameter
Min Typ Max Unit Condition/Note
Power-up ramp-up time
Power off time
1
5
ms From 0 V until reaching 1.8 V
ms Minimum time between power off and power-on.
Table 10: Power-on Reset Requirements
SWRS039B
Page 8 of 58