NXP Semiconductors
FXTH87E
FXTH87E, Family of Tire Pressure Monitor Sensors
• TA = 0 °C to 25 °C and VDD = 2.5 V to 3.6 V
• TA = 60 °C to 125 °C and VDD = 2.5 V to 3.6 V
Typical consumption
VDD = 3.6 V
VDD = 3.0 V
PTYP
PMIN_HOT
PMIN_COLD
PMIN_HOT
VDD = 2.5 V
VDD = 1.8 V
T
= -40 °C
T
= 0 °C
T
= 25 °C
T
= 60°C
T = 105 °C
A
A
A
A
A
aaa-028039
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
R
7
DATA
0
6
IFPD
0
5
ISPC
0
4
IFID
0
3
2
1
0
FNUM[3:0
W
Reset
0
0
0
0
Table 141.ꢀRFCR3 field descriptions
Field
Description
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)
7
0ꢀRF output state low.
1ꢀRF output state high.
DATA
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.
6
0ꢀThe XCO remains powered up as long as the SEND bit is set.
IFPD
1ꢀThe 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.
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.
5
0ꢀNo initial time interval.
ISPC
1ꢀInitial time interval enabled.
FXTH87ERM
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© NXP B.V. 2019. All rights reserved.
Reference manual
Rev. 5.0 — 4 February 2019
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