Datasheet

TMC262 / TMC262C DATASHEET (Rev. 2.22 / 2019-FEB-22) 49
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14 TMC262C compatibility
The TMC262C is a new derivative of the TMC262 family. It is designed for compatibility to existing
applications, while offering a number of enhancements and options, which can be activated using the
interface. Care has been taken to ensure compatibility for both devices, even if the enhanced options
are switched on.
ENHANCEMENTS IN TMC262C
• More silent chopper operation, silent motor at low motor velocity.
• VCC_IO is monitored by internal reset circuitry to ensure clean power-up and power-down.
• Overtemperature shutdown has added hysteresis, to avoid spurious switching off. Following
overtemperature, the driver stage remains switched off until the IC cools down below 120°C.
• Increased drive-level for P-MOSMETs for lower power dissipation in the external power-stage.
• Reduced power dissipation of internal circuitry, leading to lower heat-up.
• CMOS input levels are increased with 5V VCC_IO level to increase noise rejection.
• Reduced filtering time for STEP & DIR inputs to reduce the risk of missed step pulses.
OPTIONAL ENHANCEMENTS IN TMC262C (ENABLE VIA CONFIGURATION BITS)
• Clock fail-safe option. In case the external clock fails, the IC defaults back to internal clock. This
avoids damage to motor and driver stage. (Enable: EN_S2VS)
• Low-Side short detection (Short to VS). The low-side short detector provides improved robustness
in case of mis-wiring or wrongly attached motor. (Enable: EN_S2VS)
• Optional higher sensitivity high-side protection. Especially in combination with low-RDSon
MOSFETs, this feature gives a better protection. (Enable: SHRTSENS)
• Optional lower overtemperature threshold of 136°C for more sensitive protection of the power
driver. Enable: OTSENSE
The additional settings for TMC262C are highlighted in this document using green background.
The major differences to be considered when exchanging the TMC262 and TMC262C, are summed up
in the following table:
Item
Change in TMC262C
Impact
More silent
chopper with
TMC262C
Internal noise sources have been reduced. Noise
caused by internal wiring voltage drop makes up
for up to 10mV within the TMC262. This reflects in
a slightly lower sense input threshold voltage.
Reduced motor noise,
especially with low velocity.
TMC262C effective motor
current about 2-3% higher.
Undervoltage
monitoring of
VCC_IO
IO voltage VCC_IO is monitored by the internal
reset circuitry. The device becomes reset upon
VCC_IO undervoltage.
Increased VCC_IO supply
current (50µA), device resets
upon VCC_IO undervoltage.
Hysteresis for
overtemperature
detector
Following overtemperature detection at 136°C or
150°C, the driver stage remains switched off until
the IC cools down below 120°C.
Longer shutdown time upon
overtemperature detection,
safe detection by interface.
Increased P-
MOS drive level
The drive level for the P-MOS has been increased
from roughly 8V to 10V.
Reduced heat up of driver
FETs.
Input levels
depend on
VCC_IO voltage
TMC262 input level detectors are supplied by
internal 5V supply, leading to fixed 0.8V and 2.4V
levels. TMC262C uses VCC_IO supplied CMOS
Schmitt-Trigger inputs instead.
Higher positive logic level for
5V VCC_IO supply. No change
with 3.3V VCC_IO supply.
Check levels in 5V systems.
Spike filtering
time on
STEP/DIR input
The filtering has been improved, while reducing
the filtering time in order to reduce the risk of
missing short step pulses.
Potential impact in systems
with high noise level on
STEP & DIR input pins.
CLK input filter
TMC262C provides better filtering against short
pulses (10ns typ.). Attention: Date code 1837
requires>27ns high level for switching to ext. CLK
Increased robustness against
reflections on CLK line.