TDC-GP21 datasheet(36/91 Pages) AMSCO

36 / 91 page

TDC-GP21

acam messelectronic gmbh - Friedrich-List-Str.4 - 76297 Stutensee - Germany - www.acam.de

3-11

mV. 2‘s complement

6 = 6 mV

14 = - 2 mV

...

1 = 1 mV

9 = - 7 mV

0 = 0 mV

8 = - 8 mV

TW2

Timer to charge up the capacitor of the

recommend RC network when the internal

analog part is used.

Charge time:

0 = 90 µs

1 = 120 µs

2 = 150 µs

3 = 300 µs, recommended setting

EN_INT[3]

Additional interrupt source. See also register

2 for the lower 3 bits of EN_INT. The various

sources are wired by an OR. An EEPROM

action, e.g. EEPROM_COMPARE, is managed

by the TDC-GP21 and especially the EEPROM

write may last up to 130ms. Indicating the

end will be helpful.

1 = end of EEPROM action

START_CLKHS[2] Highest bit to set the settling time for the

high speed oscillator. The lower bits are set

in register 0, bit 18 and 19.

0 = off

1 = continuously on

2 = 480 µs delay

3 = 1.46 ms

4 = 2.44 ms

5 to 7 = 5.14 ms

CYCLE_TEMP

Selects timer for triggering the second

temperature measurement in multiples of

50/60Hz

0 = 1

1 = 1.5

2 = 2

3 = 2.5

CYCLE_TOF

Selects timer for triggering the second ToF

measurement in multiples of 50/60Hz

0 = 1

1 = 1.5

2 = 2

3 = 2.5

HZ60

TDC-GP21 can make complete up and down

flow measurement and also two temperature

measurements in series. The time interval

between 2 measurements is based on 50 or

60 Hz.

0 = 50 Hz base, 20 ms

1 = 60 Hz base, 16.67ms

FIREO_DEF

Specifies the default level of the inactive fire

buffer. Example: if FIRE_UP is active then the

FIRE_DOWN buffer is connected to the

default level. Setting 1 is mandatory when

using the integrated analog section.

0 = High-Z (as in GP2)

1 = LOW

QUAD_RES

Option to improve the resolution by factor 4

from 90 ps to 22 ps. Can be used only in

measurement mode 2.

0 = off (TDC-GP2 mode)

1 = on

DOUBLE_RES

Doubles the resolution from 90 ps to 45 ps.

In measurement mode 1 this option limits the

number of stop inputs to one (Stop1)

0 = off (TDC-GP2 mode)

1 = on

TEMP_PORTDIR

Ports for temperature measurement are

measured in the opposite order.

0 = PT1 > PT2 > PT3 > PT4

1 = PT4 > PT3 > PT2 > PT1

ANZ_FIRE[6:4]

Highest 3 bits of the number of fire pulses.

See also register 0. If ANZ_FIRE > 15 then

0 = off

1 = 1 pulse

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