TMC8462 Datasheet • Document Revision V1.4 • 2018-May -09
152 / 204
7.6 SII EEPROM MFC IO High Voltage IO (HVIO) Configuration
The 8 HVIO pins have additional configuration options which can be set on power up from the SII EEPROM
or later by SPI access to the memory.
The first three configuration bytes (Slope Slow, Weak High, Weak Low) each have one bit corresponding to
one HV output:
Bit
0
Output
MFC_HV0
MFC_HV1
MFC_HV2
MFC_HV3
MFC_HV4
MFC_HV5
MFC_HV6
MFC_HV7
1
2
3
4
5
6
7
Table 191: Slope Slow/Weak High/WeakLow config
Slope Slow - 0598h (SII EEPROM: 009Ch)
With this option set to 1, the output slope of the HVIO pins can be slowed down.
Weak High - 0599h (SII EEPROM: 009Dh)
With this option set to 1, the high level driver strength of the HVIO pins can be reduced.
Weak Low - 059Ah (SII EEPROM: 009Eh)
With this option set to 1, the low level driver strength of the HVIO pins can be reduced.
Differential Input Enable - 059Bh (SII EEPROM: 009Fh)
With this option set to 1, two of the HVIO inputs can be combined to a differential input pair. Only the
lower 4 bits are used to enable four specific pairs:
Bit
0
Positive input
MFC_HV3
Negative input
MFC_HV0
1
MFC_HV4
MFC_HV1
2
MFC_HV5
MFC_HV2
3
MFC_HV7
MFC_HV6
Table 192: Differential HV input configuration
The crossbar settings of MFC_HV3, MFC_HV4, MFC_HV5 and MFC_HV7 are ignored when they are used as a
differential input.
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