BD62220AEFV Datasheet, PDF (12/25 Pages) Rohm – High Performance, High Reliability 36V 2ch DC Brush Motor Drivers

BD62220AEFV
(2) Temperature Monitoring
There is a way to directly measure the approximate chip temperature by using the TEST2 terminal. However,
temperature monitor using TEST2 terminal is only for evaluation and experimenting, and must not be used in actual
usage conditions. TEST2 terminal has a protection diode to prevent electrostatic discharge. The temperature may be
monitored using this protection diode.
(a) Measure the terminal voltage when a current of I_DIODE=50μA flows from the TEST2 terminal to the GND, without
supplying VCC to the IC. This measurement is the V_F voltage inside the diode.
(b) Measure the temperature characteristics of this terminal voltage. (V_F has a linear negative temperature factor
against the temperature.) With the results of these temperature characteristics, chip temperature may be
calibrated from the TEST terminal voltage.
(c) Supply VCC, confirm the TEST2 terminal voltage while running the motor, and the chip temperature can be
approximated from the results of (b).
VCC
-Vf [mV]
TEST2
Circuitry
I_DIODE
V
Circuitry
25
150 Chip temperature Tj [°C]
Figure 10. Model Diagram for Measuring Chip Temperature
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TSZ22111・15・001
12/21
TSZ02201-0P2P0B301460-1-2
21.Jun.2016 Rev.001