X9530 Datasheet, PDF (7/30 Pages) Xicor Inc. – Temperature Compensated Laser Diode Controller

X9530
I2FSO1–I2FSO0: CURRENT GENERATOR 2 FULL SCALE OUT-
PUT CURRENT SET BITS (NON-VOLATILE)
These two bits are used to set the full scale output
current at the Current Generator 2 pin, I2. If both bits
are set to “0” (default), an external resistor connected
between pin R2 and Vss, determines the full scale
output current available at pin I2. The other three
options are indicated in the table below. The direction
of this current is set by bit I2DS in Control Register 0.
I2FSO1
0
0
1
1
I2FSO0
0
1
0
1
I2 Full Scale Output Current
Set externally via pin R2 (Default)
±0.4mA*
±0.85 mA*
±1.3 mA*
*No external resistor should be connected in these cases between
R2 and V_SS.
L1DAS: LUT1 DIRECT ACCESS SELECT BIT (NON-VOLATILE)
When bit L1DAS is set to “0” (default), LUT1 is
addressed by the output of the on-chip A/D converter.
When bit L1DAS is set to “1”, LUT1 is addressed by
bits L1DA5– L1DA0.
D1DAS: D/A 1 DIRECT ACCESS SELECT BIT (NON-VOLATILE)
When bit D1DAS is set to “0” (default), the input to the
D/A converter 1 is a row of LUT1. When bit D1DAS is
set to “1”, that input is the content of the Control
register 3.
L2DAS: LUT2 DIRECT ACCESS SELECT BIT (NON-VOLATILE)
When bit L2DAS is set to “0” (default), LUT2 is
addressed by the output of the on-chip A/D converter.
When bit L2DAS is set to “1”, LUT2 is addressed by
bits L2DA5–L2DA0.
D2DAS: D/A 2 DIRECT ACCESS SELECT BIT (NONVOLATILE)
When bit D2DAS is set to “0” (default), the input to the
D/A converter 2 is a row of LUT2. When bit D2DAS is
set to “1”, that input is the content of the Control
register 4.
Control Register 6
This register is accessed by performing a Read or
Write operation to address 86h of memory.
WEL: WRITE ENABLE LATCH (VOLATILE)
The WEL bit controls the Write Enable status of the
entire X9530 device. This bit must be set to “1” before
any other Write operation (volatile or nonvolatile).
Otherwise, any proceeding Write operation to memory
is aborted and no ACK is issued after a Data Byte.
The WEL bit is a volatile latch that powers up in the “0”
state (disabled). The WEL bit is enabled by writing
10000000₂ to Control register 6. Once enabled, the
WEL bit remains set to “1” until the X9530 is powered
down, and then up again, or until it is reset to “0” by
writing 00000000₂ to Control register 6.
A Write operation that modifies the value of the WEL
bit will not cause a change in other bits of Control
register 6.
Status Register – ADC Output
This register is accessed by performing a Read
operation to address 87h of memory.
AD5–AD0: A/D CONVERTER OUTPUT BITS (READ ONLY)
These six bits are the binary output of the on-chip A/D
converter. The output is 000000₂ for minimum input
and 111111₂ for full scale input.
REV 3.7 8/26/04
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Characteristics subject to change without notice. 7 of 30