Datasheet

TMC6200 DATASHEET (Rev. 1.04 / 2019-AUG-08) 32
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7 Diagnostics and Protection
The TMC6200 supplies a complete set of diagnostic and protection capabilities, like short circuit
protection and undervoltage detection. See the DRV_STATUS table for details.
7.1 Temperature Sensors
The driver integrates a four-level temperature sensor (120°C pre-warning and selectable 136°C / 143°C /
150°C thermal shutdown) for diagnostics and for protection of the IC and the power MOSFETs and
adjacent components against excess heat. Choose the overtemperature level to safely cover error
conditions like missing heat convection. Heat is mainly generated by the power MOSFETs, and, at
increased voltage, by the internal voltage regulators. For many applications, already the
overtemperature pre-warning will indicate an abnormal operation situation and can be used to initiate
user warning or power reduction measures like motor current reduction. The thermal shutdown is
just an emergency measure and temperature rising to the shutdown level should be prevented by
design.
After triggering the overtemperature sensor (ot flag), the driver remains switched off until the system
temperature falls below the pre-warning level (otpw) to avoid continuous heating to the shutdown
level.
7.2 Short Protection
The TMC6200 protects the MOSFET power stages against a short circuit or overload condition by
monitoring the voltage drop in the high-side MOSFETs, as well as the voltage drop in the low-side
MOSFETs (Figure 7.1). A programmable short detection delay (shortdelay) allows adjusting the detector
to work with very slow switching slopes. Additionally, the short detector allows filtering of the signal.
This helps to prevent spurious triggering caused by effects of PCB layout, or long, adjacent motor
cables (SHORTFILTER). All control bits are available via register SHORT_CONF. Additionally, the short
detection is protected against single events, e.g. caused by ESD discharges, by retrying up to three
times before switching off the motor continuously (program in SHORT_CONF.RETRY).
Parameter
Description
Setting
Comment
S2VS_LEVEL
Short or overcurrent detector level for lowside
FETs. Checks for voltage drop in LS MOSFET and
sense resistor.
4…15
1 (highest sensitivity) …
15 (lowest sensitivity)
(Reset Default: OTP 6 / 12)
S2G_LEVEL
S2G_LEVEL:
Short to GND detector level for highside FETs.
Checks for voltage drop on high side MOSFET.
2…15
2 (highest sensitivity) …
15 (lowest sensitivity)
(Reset Default: OTP 6 / 12)
SHORT_
FILTER
Spike filtering bandwidth for short detection
Hint: A good PCB layout will allow using
setting 0. Increase value, if erroneous short
detection occurs.
0…3
0 (lowest, 100ns),
1 (1µs) (Reset Default),
2 (2µs),
3 (3µs)
RETRY
Number of retries after short detection until
permanent brigde shutdown
0…3
(Reset Default = 3)
shortdelay
shortdelay: Short detection delay
The delay shall cover the bridge switching time.
0/1
0=750ns: normal,
1=1500ns: high
disable_S2VS
1: Disable short to VS protection.
0/1
Leave detection enabled
for normal use (0).
disable_S2G
1: Disable short to GND protection.
0/1
Leave detection enabled
for normal use (0).
protectparallel
0: Individual half bridge protection
1: Disable all bridges upon single half bridge
short condition
0/1
(Reset Default = 1)