NXP Semiconductors
FXTH87E
FXTH87E, Family of Tire Pressure Monitor Sensors
FXTH87ERM
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© NXP B.V. 2019. All rights reserved.
Reference manual
Rev. 5.0 — 4 February 2019
173 / 183
•
n
VOLT
= Total number of voltage measurements over lifetime
18.3 Transmission events
The overall charge consumed by the transmissions is:
(15)
where:
•
Q
XMT
= Transmit charge over lifetime, t
TOT
, in mA-hr
•
Q
FRM
= Transmit charge per frame of data in μA-sec
•
n
XMT
= Number of transmissions over lifetime
•
F = Frames transmitted during each datagram
18.4 Total consumption
The overall charge consumed is:
(16)
where:
•
Q
TOT
= Total charge over lifetime, t
TOT
, in mA-hr
•
Q
STDBY
= Standby charge over lifetime in mA-hr
•
Q
MEAS
= Measurement charge over lifetime in mA-hr
•
Q
XMT
= Transmit charge over lifetime in mA-hr
•
Y = Lifetime in years
•
SD = Battery self-discharge rate in %/year
Additional margin in battery capacity can be added to the calculated value of Q
TOT
.
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