ePWM
TMS320F2837xD Microcontroller Workshop - Control Peripherals 7 - 31
The trip-zone submodule utilizes a fast clock independent logic mechanism to quickly handle fault
conditions by forcing the EPWMxA and EPWMxB outputs to a safe state, such as high, low, or
high-impedance, thus avoiding any interrupt latency that may not protect the hardware when
responding to over current conditions or short circuits through ISR software. It supports one-shot
trips for major short circuits or over current conditions, and cycle-by-cycle trips for current limiting
operation. The trip-zone signals can be generated externally from any GPIO pin which is mapped
through the Input X-Bar (TZ1 – TZ3), internally from an inverted eQEP error signal (TZ4), system
clock failure (TZ5), or from an emulation stop output from the CPU (TZ6). Additionally, numerous
trip-zone source signals can be generated from the digital-compare subsystem.
The power drive protection is a safety feature that is provided for the safe operation of systems
such as power converters and motor drives. It can be used to inform the monitoring program of
motor drive abnormalities such as over-voltage, over-current, and excessive temperature rise. If
the power drive protection interrupt is unmasked, the PWM output pins will be put in a safe
immediately after the pin is driven low. An interrupt will also be generated.
Digital Compare Trip Inputs
GPIO
MUX
INPUT
X-BAR
ePWM
X-BAR
Digital
Compare
Sub-
Module
TRIPIN1 & TZ1
TRIPIN2 & TZ2
TRIPIN3 & TZ3
TRIPIN6
TRIPIN4
TRIPIN5
TRIPIN7
TRIPIN8
TRIPIN9
TRIPIN10
TRIPIN11
TRIPIN12
TRIPIN1 & TZ1
TRIPIN2 & TZ2
TRIPIN3 & TZ3
TRIPIN6
TRIPIN4
TRIPIN5
TRIPIN7
TRIPIN8
TRIPIN9
TRIPIN10
TRIPIN11
TRIPIN12
TRIP COMBO
DCAHTRIPSEL
DCALTRIPSEL
DCBHTRIPSEL
DCBLTRIPSEL
TRIPIN14 (ECCDBLERR)
TRIPIN15 (PIEERR)
TRIPIN15
TRIPIN14
The digital compare submodules receive their trip signals from the Input X-BAR and ePWM X-
BAR.
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