CS5501-BS Cirrus Logic Inc, CS5501-BS Datasheet - Page 50

• Manufacturer Part Number: CS5501-BS
• Description: A/D Converter (A-D) IC
• Manufacturer: Cirrus Logic Inc

Specifications of CS5501-BS

• Peak Reflow Compatible (260 C): No
• No. Of Bits: 16 Bit
• Leaded Process Compatible: No
• Mounting Type: Surface Mount
• Interface Type: Serial
• Package / Case: 20-SOIC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

"D" input to flip-flop U8B is enabled to a "1" at
the same time CS goes low. When DRDY returns
high flip-flop U8B is toggled and resets the
counter back to zero which terminates the CS en-
able. The counter then accumulates counts until
the selected output activates CS low once again.
DIP Switch Selections/Calibration Initiation
Several control pins of the CS5501/CS5503 can
be level activated by DIP switch selection, or by
microcontroller at P8, as shown in Figure 5. DIP
switch SW1 selections are depicted in Tables 5
and 6. The CAL pushbutton is used to initiate a
calibration cycle in accordance with DIP switch
positions 1 and 2. The CAL pushbutton should be
V+
50
Figure 5. DIP Switch / Header Control Pin Selection
SW1
WARNING: Some evaluation boards were produced with the
Table 5. DIP Switch Selections
SC2
P8
17
1
Switch
SW1-1
SW1-2
SW1-3
SW1-4
SC2
SC1 and SC2 labels reversed on the silkscreen
SC1
4
2
SC1
UNIPOLAR
SC2 = 0
SC1 = 0
SLEEP
BP/UP
ON
12
3
CS5503
CS5501/
B/U
U4
SLEEP
BIPOLAR
SC2 = 1
SC1 = 1
AWAKE
11
OFF
CAL
4
SLP
13
CAL
CAL
SW2
V+
CAL
SC1
0
1
0
1
SC2
activated any time power is first applied to the
board or any time the conversion mode (BP/UP)
is changed on the DIP switch. Remote control of
the CAL signal is available on connector P8.
Connector P8 also allows access to the DIP
switch functions by a microcomputer/microcon-
troller. The DIP switches should be placed in the
off position if off-board control of the signals on
connector P8 is implemented.
Voltage Reference
The evaluation board includes a 2.5 volt refer-
ence. Potentiometer R9 can be used to trim the
reference output to a precise value.
Analog Input Range: Unipolar Mode
The value of the reference voltage sets the analog
input signal range. In unipolar mode the analog
input range extends from AGND to VREF. If the
analog input goes above VREF the converter will
output all "1’s". If the input goes below AGND,
the CS5501/CS5503 will output all "0’s".
Analog Input Range: Bipolar Mode
The analog signal input range in the bipolar mode
is set by the reference to be from +VREF to -
VREF. If the input signal goes above +VREF, the
CS5501/CS5503 will output all "1’s". Input sig-
nals below -VREF cause the output data to be all
"0’s".
0
1
1
0
Table 6. Calibration Mode Table
& System Gain
System Offset
System Offset
Cal Type
Self-Cal
AGND
ZS Cal
AIN
AIN
-
CDB5501/CDB5503
FS Cal
VREF
VREF
AIN
-
Sequence
One Step
One Step
2nd Step
1st Step
DS31DB3