WM8170 Datasheet, PDF (35/41 Pages) Wolfson Microelectronics plc – 3.3V Integrated Signal Processor for Area Array CCDs

WM8170
Product Preview Rev 1.0
CONTROL BITS
DESCRIPTION
AUX DAC CONTROL (010000)
AUX1X1
Auxiliary DAC1 scaling factor.
AUX1X1
0
TIMES2
1
TIMES1
AUX2X1
Auxiliary DAC2 scaling factor.
AUX2X1
0
TIMES2
1
TIMES1
DC CORRECT CONTROL (001111)
ENINTBLC
Used to select between the BLCENB pin and the INTBLCENB pulse for the Analogue Loop Enable
ENINTBLC
0
BLCENB pin controls the Analogue Correction Loop
1
INTBLCENB pulse controls the Analogue Correction Loop
ENHD
Changes pin 26 between PBLK and HD functions
ENHD
0
Pin 26 is PBLK function
1
Pin 26 is HD function
ENVD
Changes pin 30 between PDB and VD functions
ENVD
0
Pin 30 is PDB function
1
Pin 30 is VD function
PGAUPD
Update the analogue control loop after PGA writes only
PGAUPD
0
Enable INTBLCENB Pulse to Analogue Loop on every frame.
1
Enable INTBLCENB Pulse to Analogue Loop only after PGA Register has been written to.
STPANAL
Stops the INTBLCENB signal from enabling the analogue control loop
STPANAL
0
INTBLCENB can be steered to the Analogue Loop Enable
1
INTBLC will be prevented from being steered to the Analogue Loop Enable, and will be used
for the IIR Filter Enable instead.
STPIIR
Stops the INTBLCENB signal from enabling the IIR filter
STPIIR
0
INTBLCENB can be steered to the IIR Filter Enable
1
INTBLC will be prevented from being steered to the IIR Filter Enable
ACON[1:0]
Used to control the function of the Area Pulse Generator
ACON1
ACON0
0
0
Area define signal turned off.
0
1
Area define signal used to update the internal register which holds the
error calculated by the IIR filter. In other conditions the internal register
which holds the error calculated by the IIR filter is enabled whenever the
IIR filter is enabled.
1
0
Area Define signal used to enable the Analogue DC Correction circuitry in
addition to the analogue enable generated from the INTBLCENB pulse
generator.
1
1
Area Define signal is used to enable the IIR filter in addition to the IIR filter
enable generated from the INTBLCENB pulse generator.
WOLFSON MICROELECTRONICS LTD
PP Rev 1.0 March 2000
35