Datasheet

Programming manual L6470
46/73 DocID16737 Rev 7
9.1.15 K_THERM
The K_THERM register contains the value used by the winding resistance thermal drift
compensation system (see Section 7.6 on page 37).
The available range is from 1 to 1.46875 with a resolution of 0.03125, as shown in Table 13.
9.1.16 ADC_OUT
The ADC_OUT register contains the result of the analog-to-digital conversion of the ADCIN
pin voltage; the result is available even if the supply voltage compensation is disabled.
Any attempt to write to the register causes the command to be ignored and the
NOTPERF_CMD flag to rise (see Section 9.1.22 on page 55).
Table 13. Winding resistance thermal drift compensation coefficient
K_THERM [3 .… 0] Compensation coefficient
0000 1
0 0 0 1 1.03125
… … … … …
1110 1.4375
1 1 1 1 1.46875
Table 14. ADC_OUT value and motor supply voltage compensation feature
V
S
V
ADCIN
/V
REG
ADC_OUT
[4 … 0]
Compensation
coefficient
Greater than V
S
,
nom
+ 50% > 24/32 1 1 X X X 0.65625
V
S
,
nom
+ 50% 24/32 1 1 0 0 0 0.65625
… … … … … … … …
V
S
,
nom
16/32 10000 1
… … … … … … … …
V
S
,
nom
– 50% 8/32 0 1 0 0 0 1.968875
Lower than V
S
,
nom
– 50% < 8/32 0 0 X X X 1.968875