TDC-GP21 datasheet(80/91 Pages) AMSCO

80 / 91 page

TDC-GP21

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5-7

Driver outputs:

The output drivers are configured by setting CONF_FIRE in register 5, bits 29 to 31:

CONF_FIRE configures the FIRE_UP and FIRE_DOWN outputs of the GP21. CONF_FIRE is

used to control which of the outputs (FIRE_UP or FIRE_DOWN) are first fired when the

Start_TOF_Restart command is issued. It is also used to individually enable or disable

these outputs.

Only one of the three bits may be set to 1:

Bit 31 = 1

Fire both outputs (FIRE_UP and FIRE_DOWN) simultaneously. In this

case, the FIRE_DOWN output is an inverted representation of

FIRE_UP.

Bit 30 = 1

Enable FIRE_UP output only, or when Start_TOF_Restart is issued, fire

this output first.

Bit 29 = 1

Enable FIRE_DOWN output only, or when Start_TOF_Restart is issued,

fire this output first.

Note:

In register 5, bits 16 to 18, REPEAT_FIRE originally had been implemented for sing around

measuring. Please set

REPEAT_FIRE = 0

no repetition

5.3

Fast Initialization

In measurement mode 1 the TDC-GP21 offers the possibility of a fast initialization.

Activated by setting register 1, bit 15, EN_FAST_INIT = “1“ the interrupt flag automatically

Example:

CLKHS = 4 MHz, DIV_CLKHS = 1, DIV_FIRE = 1

Max. frequency of the FIRE_UP / FIRE_DOWN output signal:

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TDC-GP21 Datasheet(PDF) 80 Page - ams AG