ZAMC4100 Datasheet, PDF (80/155 Pages) Integrated Device Technology – Actuator and Motor Controller

ZAMC4100 Datasheet
Diode Temperature Measurement on AIN3, AIN4
If the application requires external temperature measurements using a diode-based sensor, it can be connected
to input AIN3 or AIN4 (Figure 3.22). Both inputs have an internal current source that is enabled with bits
AIN3TMEN and AIN4TMEN in register AINCONF (Table 3.32). The current sources are internally controlled by
the ADC in order to provide two currents with a fixed ratio 1:10. This ratio is used for the calculation of the
temperature based on the measured results.
Figure 3.22 Using AIN3 and AIN4 for External Temperature Measurement
AIN3/4
VDD5V0
CS ratio
1:10
AINxTMEN
Temp.
Sensor
VSSA
ZAMC4100
Int.Ref
VREF
VREFP
ADC
VREFN
For more information about the temperature measurement including the LM135 and thermistors, refer to the
ZAMC4100 Application Note – ADC.
Table 3.32 AINCONF Register Bits Mapping
Name
AINCONF
Bit No
7
6
5
4
3
2
1
0
Bit name
Reset
0
0
0
0
0
0
0
0
Access
R/W R/W R/W R/W R/W R/W R/W R/W
Address
0x10
R/W = Read/Write bit
Note: When the ADC conversion is running, the AINCONF register is accessed as
read-only.
© 2016 Integrated Device Technology, Inc.
80
January 26, 2016