NXP Semiconductors
FXTH87E
FXTH87E, Family of Tire Pressure Monitor Sensors
Field
Description
RF Amplifier Power Level — The PWR[4:0] control bits select the optimum power output of the RF power
amplifier. These power output levels assume optimal matching network to the RF pin. The PWR[4:0] control
bits are cleared a RFM reset. The PWR control bits are initially set to 0x00. This setting targets –10 dBm
typical power output. The PWR control bits scale the typical output power level from –1.5 to 8 dBm in steps
of 0.5 dB and fixes the low power level mode to –10 dBm, The power control range is defined as follows:
00000ꢀset output power level to –10 dBm (Default Value)
00001ꢀset output power level to –1.5 dBm
00010ꢀ set output power level to –1.0 dBm
00011ꢀset output power level to –0.5 dBm
00100ꢀset output power level to 0.0 dBm
00101ꢀset output power level to 0.5 dBm
00110ꢀset output power level to 1.0 dBm
00111ꢀset output power level to 1.5 dBm
01000ꢀset output power level to 2.0 dBm
01001ꢀset output power level to 2.5 dBm
01010ꢀset output power level to 3.0 dBm
01011ꢀset output power level to 3.5 dBm
01100ꢀset output power level to 4.0 dBm
01101ꢀset output power level to 4.5 dBm
01110ꢀset output power level to 5.0 dBm
01111ꢀset output power level to 5.5 dBm
10000ꢀset output power level to 6.0 dBm
10001ꢀset output power level to 6.5 dBm
10010ꢀset output power level to 7.0 dBm
10011ꢀset output power level to 7.5 dBm
10100ꢀset output power level to 8.0 dBm
Codes greater than 10100 are reserved for test purposes and should not be used.
4:0
PWR[4:0]
15.11.1 Power working domains
The working areas of the RF transmitter are divided into several domains as defined in
Figure 46.
15.11.1.1 PTYP
TA = 25 °C to 60 °C and VDD = 2.5 V to 3.6 V
PTYP is where the power step is adjusted to guarantee 5 dBm. The power consumption in
this domain is specified at 5 dBm output power step at nominal conditions of TA = 25 °C
and VDD = 3 VDC.
15.11.1.2 PMIN
PMIN is where the power step is adjusted to guarantee a minimum of 3 dBm as shown in
Figure 46. The power consumption in this domain is given as the maximum consumption
at whatever temperature of supply voltage condition. The PMIN domain is subdivided into
two areas according to the lowest supply voltage encountered (1.8 or 2.5 VDC).
PMIN_COLD
• TA = –40 °C to 0 °C and VDD = 1.8 V to 3.6 V
PMIN_HOT
FXTH87ERM
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© NXP B.V. 2019. All rights reserved.
Reference manual
Rev. 5.0 — 4 February 2019
147 / 183
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