TDC-GP21 datasheet(39/91 Pages) AMSCO

39 / 91 page

Ultrasonic-Flow-Converter

TDC-GP21

3-14

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d. Temperature measurement

Discharge time in the same format as in c., measurement mode 2.

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:

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