TMC260 and TMC261 DATASHEET (Rev. 2.05 / 2012-NOV-05)
40
Status
Description
Range
Comment
OTPW
Overtemperature warning. This bit indicates 0 / 1
whether the warning threshold is reached.
Software can react to this setting by reducing
current.
1: temperature
prewarning level
reached
OT
Overtemperature shutdown. This bit indicates 0 / 1
whether the shutdown threshold has been
reached and the driver has been disabled.
1: driver shut down
due to over-
temperature
11.4 Undervoltage Detection
The undervoltage detector monitors both the internal logic supply voltage and the supply voltage. It
prevents operation of the chip when the MOSFETs cannot be guaranteed to operate properly because
the gate drive voltage is too low. It also initializes the chip at power up.
In undervoltage conditions, the logic control block becomes reset and the driver is disabled. All
MOSFETs are switched off. All internal registers are reset to zero. Software also should monitor the
supply voltage to detect an undervoltage condition. If software cannot measure the supply voltage,
an undervoltage condition can be detected when the response to an SPI command returns only zero
bits in the response and no bits are shifted through the internal shift register from SDI to SDO. After
a reset due to undervoltage occurs, the CS parameter is cleared, which is reflected in an SE status of 0
in the read response.
VVS
VUV
ca. 100µs
ca. 100µs
Time
Reset
Device in reset: all
registers cleared to 0
Figure 11.2 Undervoltage reset timing
Note: Be sure to operate the IC significantly above the undervoltage threshold to ensure reliable
operation! Check for SE reading back as zero to detect an undervoltage event.
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