©

©

©

© 2001 Advanced Linear Devices, Inc., 415 Tasman Drive, Sunnyvale, California 94089-1706, Tel: (408) 747-1155, Fax: (408) 747-1286

ALD523D

12/01

8 of 20

SELECTING AND CONFIGURING DISPLAY

SETTINGS

The ALD523D uses SEL0 and SEL1 control-input pins for

selecting different display sets “DGS0”, “DGS1”,

“DGS2”, and “DGS3”. Each display set “DGSx” has an

associated mode of operation “Mx”, unit display “UNTx”,

decimal point placement “LxDEC”, and multiplier scale

factors “

±CALx”, where x=0, 1, 2 or 3.

The SEL0 and SEL1 switches have 4 logical states of

operations as described in Table 3. Each logical state

combination selects different measurement labels/units,

scale factors, decimal point location, and mode selections.

In all modes of operation, the SEL0 and SEL1 software

switch setting selections override the hardware jumper

functions of the DEC1 and DEC2 or M and Z switches

when either SEL0 or SEL1 are set to logical “1”.

When SEL0=0 and SEL1=0, the ALD523D selects

display set “DGS0”, which consists of a combination of

“M1”, “UNT1”, “+CAL1” and “

−CAL1” parameters from

addresses 00H, 18H to 1FH, 30H to 37H, and 38H to 3FH

of the EEPROM memory, respectively. In the calibrated

reference mode (mode-A) and the display only mode

(mode-C), DEC1 and DEC2 hardware jumper switches are

used to place decimal point. In mode-B operation, no

decimal point is displayed.

When SEL0=1 and SEL1=0, the ALD523D selects

display set “DGS1”, which consists of a combination of

“M1”, “L1DEC”, “UNT1”, “+CAL1” and “

−CAL1”

parameters from addresses 00H, 05H, 18H to 1FH, 30H to

37H, and 38H to 3FH of the EEPROM memory,

respectively. The decimal point is placed according to the

content of the “L1DEC” parameter.

When SEL0=0 and SEL1=1, the ALD523D selects

display set “DGS2”, which consists of a combination of

“M2”, “L2DEC”, “UNT2”, “+CAL2” and “

−CAL2”

parameters from addresses 01H, 06H, 20H to 27H, 40H to

47H, and 48H to 4FH of the EEPROM memory,

respectively. The decimal point is placed according to the

content of the “L2DEC” parameter.

When SEL0=1 and SEL1=1, the ALD523D selects

display set “DGS3”, which consists of a combination of

“M3”, “L3DEC”, “UNT3”, “+CAL3” and “

−CAL3”

parameters from addresses 01H, 07H, 28H to 2FH, 50H to

57H, and 58H to 5FH of the EEPROM memory,

respectively. The decimal point is placed according to the

content of the “L3DEC” parameter.

Each of the “M1”, “M2”, and “M3” parameters is a 4-bit

hexadecimal number located on the first line of the .CDS

file (see Table 1 of the ALD523D Setup and Calibration

Software User Guide for the data sheet layout). Each of

these “M1”, “M2”, and “M3” parameters can have content

data of “A”, “B”, “C” or “D” which corresponds to mode-

A, mode-B, mode-C default mode, or mode-C clock and

sign bit inverted polarity mode, respectively.

Each of the “L1DEC”, “L2DEC”, and “L3DEC”

parameters is an 8-bit hexadecimal number at addresses

05H, 06H, and 07H of the first line location of the .CDS

file, respectively.

Table 3. Display setting switch configurations and operations

.

GROUP

J1

FUNCTION

DISPLAY SETTING

PIN

19

20

DISPLAY SET

OPERATION

SWITCHES

SEL0

SEL1

UNIT

MULTIPLIER

DECIMAL

MODE SELECTION

0

0

DGS0

UNT1

±CAL1

J2/NoDec

M1

1

0

DGS1

UNT1

±CAL1

L1DEC

M1

0

1

DGS2

UNT2

±CAL2

L2DEC

M2

1

1

DGS3

UNT3

±CAL3

L3DEC

M3