GE IC697VAL348 user manual Control Register Data Format and Definitions

3

Example: The analog output for a digital input of 0A00H would be:

1.0A00H decimal equivalent is 2560

2.Analog out = -10 V + ((2560) __20__) 65,536

=-9.21875

Table 3-4. Control Register Data Format and Definitions

D15

Not

Used

D14

Control and Status Register

D13 D12 D11 D10

Not

Used

D09

D08

D07

D06

Control and Status Register

D05 D04 D03 D02

Not Used

D01

D00

Bit D15:	Not used.
Bit D14:	A low state turns the Fail LED ON. A high state turns the Fail LED OFF.
	At power-up this control bit is low.
Bit D13:	A high state enables the selected analog output to pass out the P2 connector
	on test bus 2 (AOTESTBS). At power-up this control bit is low.
Bit D12:	A high state enables the selected analog output to pass out the P2 connector
	on test bus 1 (AINTESTBS). At power-up this control bit is low.
Bit D11(1):	When written high, it engages one analog output from the DAC to one of
	two test buses. Used in conjunction with D12 and D13 to determine which
	test bus is selected. At power-up this control bit is low which disengages
	the test buses.
Bit D10:	Not used.
Bit D09:	Program Control Start Convert. When set to a "one", it generates a signal
	that transfers contents of previously loaded DACs to the second rank
	register and updates the analog output.
Bit D08:	Don’t care
Bits 07 through 00:	Not used.

(1)Channel selection for muxing one of the outputs to either test bus is achieved by writing the CSR data to the data address + 10H. See “Test Mode Programming” on page 3-7 for additional information.

3-4	IC697VAL348 8-Channel, 16-bit Digital-to-Analog Converter Board User’s Manual	GFK-2059
	– December 2001