TDC-GP22 datasheet(39/93 Pages) AMSCO

39 / 93 page

Ultrasonic-Flow-Converter

TDC-GP22

3-16

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The ratio of the discharge times equal the ratio of resistance:

RT = Rref * T/ref

3.2.2

Status Register

Table 3-3: Status registers

Bits

Name

Description

Values

2 – 0 ALU_OP_PTR

ALU operation pointer. Pointer to the result register.

See description below

5 – 3 # of hits Ch 1

Number of hits registered on channel 1

8 – 6 # of hits Ch 2

Number of hits registered on channel 2

Timeout TDC

Indicates an overflow of the TDC unit

1 = overflow

Timeout Precounter

Indicates an overflow of the 14 bit precounter in MR 2

1 = overflow

Error open

Indicates an open sensor at temperature

measurement

1 = open

Error short

Indicates a shorted sensor at temperature

measurement

1 = short

EEPROM_Error

Single error in EEPROM which has been corrected

1 = error

EEPROM_DED

Double error detection. A multiple error has been

detected which can not be corrected.

1 = multiple

error

EEPROM_eq_CREG

Indicates whether the content of the configuration

registers equals the EEPROM

1 = equal

ALU Operation Pointer

Description: The ALU operation pointer is stored in bits 0-2 of the status register (range

of 0x00 to 0x03) and provides an index to one of the 4 results registers (RES_0 to RES_3)

as follows:



When the EN_AUTOCALC_MB2 parameter is set to 0, and therefore

autocalculation is OFF, the ALU operation pointer is set to the next free result

measurement is performed. Therefore after a TDC measurement ALU_OP_PTR

minus 1 will point to the ALU result.



When EN_AUTOCALC_MB2 is 1 (autocalculation ON) and once a TDC measurement

is performed the ALU operation pointer is set to the result register that contains

the sum of the hit calculations stored in RES_0 to RES_2. This calculation does not

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