NXP Semiconductors
FXTH87E
FXTH87E, Family of Tire Pressure Monitor Sensors
FXTH87ERM
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Reference manual
Rev. 5.0 — 4 February 2019
148 / 183
•
T
A
= 0 °C to 25 °C and V
DD
= 2.5 V to 3.6 V
•
T
A
= 60 °C to 125 °C and V
DD
= 2.5 V to 3.6 V
aaa-028039
VDD = 3.6 V
VDD = 3.0 V
PMIN_COLD
PMIN_HOT
PTYP
PMIN_HOT
VDD = 2.5 V
VDD = 1.8 V
T
A
= -40 °C
T
A
= 0 °C
T
A
= 25 °C
T
A
= 60°C
T
A
= 105 °C
Typical consumption
Figure 46. RF power domains
15.12 RFM control register 3 — RFCR3
The RFCR3 register contains eight control bits for the RFM as described in
Table 140
which sets the number of frames in each RF datagram.
Table 140. RFM control register 3 (RFCR3) (address $0033)
Bit
7
6
5
4
3
2
1
0
R
W
DATA
IFPD
ISPC
IFID
FNUM[3:0
Reset
0
0
0
0
0
0
0
0
Table 141. RFCR3 field descriptions
Field
Description
7
DATA
Data State — The DATA bit determines the output state of the RF power amplifier when the RFM is in the
MCU direct control mode (CODE[1:0] = 11)
0 RF output state low.
1 RF output state high.
6
IFPD
Interframe Power Down — The IFPD control bit selects whether the XCO and associated analog blocks are
powered down during interframe timing caused by the RFM. The IFPD control bit is cleared by the RFMRST
signal.
0 The XCO remains powered up as long as the SEND bit is set.
1 The XCO is powered down during RFM controlled interframe timing events.
The restart of these functions will start 1 ms before the end of the timing interval if another frame is to be
transmitted.
5
ISPC
Initial Random Space — When the ISPC bit is set the initial time delay before the first frame will be enabled.
This bit is cleared by an RFM reset.
0 No initial time interval.
1 Initial time interval enabled.
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