NXP Semiconductors UM11227 User Manual

NXP Semiconductors
UM11227
NTM88 family of tire pressure monitor sensors
UM11227 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2020. All rights reserved.
User manual Rev. 6 — 24 April 2020
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Where:
Q
MEAS
= Total measurement charge over lifetime in mA-sec
Q
PRESS
= Measurement charge per pressure measurement in μA-sec
Q
TEMP
= Measurement charge per temperature measurement in μA-sec
Q
VOLT
= Measurement charge per voltage measurement in μA-sec
n
PRESS
= Total number of pressure measurements over lifetime
n
TEMP
= Total number of temperature measurements over lifetime
n
VOLT
= Total number of voltage measurements over lifetime
10.27.3 Transmission events
The overall charge consumed by the transmissions is:
(13)
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
10.27.4 Total consumption
The overall charge consumed is:
(14)
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
.

NXP Semiconductors UM11227 Specifications

General

Brand	NXP Semiconductors
Model	UM11227
Category	Accessories
Language	English