TMS320F28375DPZP datasheet(115/222 Pages) TI1

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CTRIPx = 0

CMPINxN or

DACxVAL

CTRIPx = 1

Hysteresis

COMPINxP

Voltage

CTRIPx

Logic Level

CTRIPx = 0

CMPINxN or

DACxVAL

CTRIPx = 1

Input Referred Offset

COMPINxP

Voltage

CTRIPx

Logic Level

115

TMS320F28379D, TMS320F28378D, TMS320F28377D

TMS320F28376D, TMS320F28375D, TMS320F28374D

www.ti.com

SPRS880K – DECEMBER 2013 – REVISED NOVEMBER 2018

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TMS320F28374D

Specifications

5.10.2.1 CMPSS Electrical Data and Timing

Table 5-54 shows the comparator electrical characteristics. Figure 5-39 shows the CMPSS comparator

input referred offset. Figure 5-40 shows the CMPSS comparator hysteresis.

(1)

The CMPSS DAC is used as the reference to determine how much hysteresis to apply. Therefore, hysteresis will scale with the CMPSS

DAC reference voltage. Hysteresis is available for all comparator input source configurations.

Table 5-54. Comparator Electrical Characteristics

over recommended operating conditions (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Power-up time (from COMPCTL[COMPDACE] to

comparator ready)

µs

Comparator input (CMPINxx) range

VDDA

Input referred offset error

–20

Hysteresis(1)

CMPSS

DAC LSB

Response time (delay from CMPINx input change

to output on ePWM X-BAR or Output X-BAR)

Step response

Ramp response (1.65 V/µs)

Ramp response (8.25 mV/µs)

NOTE

The CMPSS inputs must be kept below VDDA + 0.3 V to ensure proper functional operation. If

a CMPSS input exceeds this level, an internal blocking circuit will isolate the internal

comparator from the external pin until the external pin voltage returns below VDDA + 0.3 V.

During this time, the internal comparator input will be floating and can decay below VDDA

within approximately 0.5 µs. After this time, the comparator could begin to output an incorrect

result depending on the value of the other comparator input.

Figure 5-39. CMPSS Comparator Input Referred Offset

Figure 5-40. CMPSS Comparator Hysteresis

TMS320F28375DPZP Datasheet(PDF) 115 Page - Texas Instruments

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