Battery Monitor Registers; Values For A And B (For A Typical Device) When Using The Battery Monitor For Temperature Monitoring - Texas Instruments CC253x User Manual

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The temperature sensor is inversely proportional to BATTMON_VOLTAGE. The temperature (in °C)
corresponding to a given BATTMON_VOLTAGE is given by:
Temp
=
BATTMON_VOLTAGE<4:0>
Assuming BATTMON_VOLTAGE < 27, and only valid for –40°C < Temp < 125°C, A and B for a typical
device are given in
Note that A should be relatively constant for all devices, but B is not. Information that can be used to
calculate B for a given chip is included in the chip's information page (see
about the information page).
Example:
Find the BATTMON_VOLTAGE setting that tells whether the temperature is above or below 75°C.
BATTMON_VOLTAGE<4:0>
The closest setting is 16, which corresponds to approximately 70°C (see
BATTMON_VOLTAGE, an output of BATTMON_OUT = 1 tells that the temperature is above 70°C, whereas
BATTMON_OUT = 0 tells that it is below 70°C.

13.3 Battery Monitor Registers

This section describes the battery monitor registers.
SWRU191F – April 2009 – Revised April 2014
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A
B
-
Table 13-2.
Table 13-2. Values for A and B (for a Typical Device)
When Using the Battery monitor for Temperature
Monitoring
Constant
A
B
6470
15.82
= =
75 334
+
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Battery Monitor Registers
Typ
6470
334
Section 2.2.3
Table 13-1). By writing 16 to
Battery Monitor
(1)
for information
(2)
141