Datasheet

TMC8462 Datasheet • Document Revision V1.5 • 2019-June-21
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7.21 MFC IO Analog and High Voltage Block
7.21.1 Multi Voltage High Current I/O Lines
VIOx
MFC_HVx
MFCIOx.short2VS
GNDIO
OUTx
Slope
controlled
driver
Level
shifter
Level
shifter
Output
control block
Slope
controlled
driver
MFCIOx.weak_h
MFCIOx.weak_l
SLOPE
SLOPE
Short
protection
1.2V
1/2 VIOx
Input control
block
17/40 VIOx
1µs
INx
SLOPE
MFC_HVy
MFCIOx.slope
MFCIOx.differential
MFCIOx.hv_on
VIOx
5.5V
Weak low
Weak high
100µA
100µA
5

MOSFET
0.3V hyst.
S
R
Q
differential
low voltage &
fast slope
10

MOSFET
DisableLS
MFCIOx.slowslope
OEx
OUTx
MFCIOx.short2GND
DisableHS
10µA ||
1.5M
HV or slow
slope
Figure 51: Schematic of multi voltage I/O port
Output Characteristics The multi voltage I/O lines allow direct driving of loads like lamps, LEDs or
solenoids with up to 100mA output current (200mA short time peak). They can be operated in a push / pull
mode, or in low current mode by using an internal pullup / pulldown resistor / current source combination.
The eight multi-voltage I/Os are grouped into three groups, which allow the use at the same, or different
supply voltages.
In case inductive loads are driven, or loads with long interconnection cables, Schottky protection diodes
shall be added in order to avoid exceeding the respective supply voltage limits.
A slope limited mode allows reducing electromagnetic emission by using slower switching slopes. Additional
filter capacitors (up to 1nF recommended) may be placed on the output lines in this mode to eliminate any
HF noise.
The outputs provide a short to GND and short to supply protection. When an overcurrent condition is
detected, the respective MOSFET remains switched off for the period of constant polarity. The short circuit
detection features a current dependent activation time. The lower activation threshold is about 150mA.
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