x9530 Intersil Corporation, x9530 Datasheet - Page 7

• Manufacturer Part Number: x9530
• Description: Temperature Compensated Laser Diode Controller
• Manufacturer: Intersil Corporation

I2FSO1–I2FSO0: C
S
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.
*No external resistor should be connected in these cases between
R2 and V
L1DAS: LUT1 D
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 D
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 D
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.
I2FSO1
CALE
0
0
1
1
SS
O
UTPUT
.
)
)
)
I2FSO0
0
1
0
1
C
IRECT
IRECT
IRECT
URRENT
URRENT
Set externally via pin R2 (Default)
I2 Full Scale Output Current
A
A
A
CCESS
CCESS
CCESS
7
S
ET
G
ENERATOR
B
±0.85 mA*
S
S
S
±1.3 mA*
ITS
±0.4mA*
ELECT
ELECT
ELECT
(N
ON
B
B
B
2 F
-
IT
IT
VOLATILE
IT
(N
(N
(N
ULL
ON
ON
ON
-
-
-
)
X9530
D2DAS: D/A 2 D
VOLATILE
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: W
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
10000000
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 00000000
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 C
ONLY
These six bits are the binary output of the on-chip A/D
converter. The output is 000000
and 111111
)
RITE
)
2
2
to Control register 6. Once enabled, the
for full scale input.
E
NABLE
IRECT
2
ONVERTER
to Control register 6.
L
A
ATCH
CCESS
(V
O
UTPUT
OLATILE
S
2
ELECT
for minimum input
B
ITS
)
B
November 11, 2005
IT
(R
(N
EAD
FN8211.1
ON
-