Data Sheet

TB67S249FTG

2017-08-18

12. FLIM (AGC Frequency limit) function

The FLIM pin sets the bottom frequency limit for the AGC to be active. It can reduce the resonance frequency of the motor

start in using AGC. The FLIM pin is a 4 stated logic input.

Note: Built-in digital filter of 0.625 μs (±20%) is adopted to FLIM pin.

FLIM Function

VCC short

Frequency limit: ON, AGC is invalid when fCLK is below 675 Hz

VCC-100 kΩ pull-up

Frequency limit: ON, AGC is invalid when fCLK is below 450 Hz

GND-100 kΩ pull-down

Frequency limit: ON, AGC is invalid when fCLK is below 225 Hz

GND short

FLIM: OFF

Note: Resistance accuracy should be within ±20%.

The frequency in the table above is in the case of full step resolution. Frequency limit threshold depends on the step

resolution setting.

FLIM 1/1 1/2 (a) 1/2 (b) 1/4 1/8 1/16 1/32

VCC short

675 Hz 1.35 kHz 1.35 kHz 2.7 kHz 5.4 kHz 10.8 kHz 21.6 kHz

VCC-100 kΩ pull-up

450 Hz 900 Hz 900 Hz 1.8 kHz 3.6 kHz 7.2 kHz 14.4 kHz

GND-100 kΩ pull-down 225 Hz 450 Hz 450 Hz 900 Hz 1.8 kHz 3.6 kHz

7.2 kHz

GND short

FLIM: OFF

Note: Resistance accuracy should be within ±20%.

13. LTH (AGC detection threshold) function

The LTH pin sets the AGC detection threshold. Connect a 100 kΩ pull-down resistor to GND.

LTH Function

GND-100 kΩ pull-down

Standard configuration for AGC detection threshold

Note: Resistance accuracy should be within ±20%.