iC-TW3 SENSOR SIGNAL CONDITIONER WITH
TEMPERATURE COMPENSATION AND LINE DRIVER
Rev B1, Page 17/24
OGAINZ(1:0)
Code
Adr 0x02; Bit 5:4
R/W
Gain and offset
Function
0 dB (default)
reserved
+6 dB
Gain and offset selections on channel Z are made
available by providing control bits GAINZ(2:0) and
OFSZ(5:0). Note that the maximum value for gain on
channel Z is 6 which corresponds to a total gain of
36 dB.
0x00
0x01
0x02
0x03
-3 dB
Table 24: Output amplifier gain on channel Z
GAINZ(2:0) is split up amongst register 0x06 which
holds the MSB and register 0x07 holding the other two
bits. OFSZ(5:0) is the correction value to the output
of the input amplifier and is interpreted as 2’s comple-
ment. The input referred offset is therefore gain de-
pendent.
Input error detection
Pull-up resistor and error detection on channel Z can
be controlled by bit ENSIGZ of register 0x03, disabling
of the complete Z path can be achieved by setting bit
PDZ of register 0x04 to 1. For more detailed informa-
tion on pull-up and power control refer to section "A/B
PATH" on page 14 as the behaviour of index path and
signal path equal regarding these matters.
The output gain on channel Z can be set via control bits
OGAINZ(1:0). For more details again refer to section
"A/B PATH" on page 14.
ENSIGZ
Code
0
Adr 0x03; Bit 1
Function
R/W
Pull-up resistors disconnected and error reporting
disabled (default)
GAINZ(2:0)
Adr 0x06; Bit 7
R/W
1
Pull-up resistors and error reporting active on inZ
Adr 0x07; Bit 1:0
Code
0x00
0x01
...
gain = gainz x 6 dB
Table 25: Input signal error detection control
0 dB (default)
6 dB
PDZ
Code
0
Adr 0x04; Bit 2
Function
R/W
0x06
36 dB
Channel Z is enabled (default)
Channel Z is powered down
1
Table 22: Gain select for channel Z
Table 26: Power-down control on channel Z
OFSZ(5:0)
Code 2’K
0x21
Adr 0x06; Bit 5:0
R/W
offset = cofs x 60 mV
Polarity of channel Z
Furthermore, the polarity on channel Z can be inverted
by setting or not setting bit POLARITYZ.
Decimal
-31
...
-1860 mV
...
0x3F
0x00
-1
-60 mV
POLARITYZ
Adr 0x02; Bit 0
Function
R/W
0
0 mV (default)
60 mV
Code
0x01
+1
...
...
0
1
Channel Z has normal polarity (default)
Channel Z has inverted polarity
0x1F
+31
1860 mV
Table 23: Offset select for channel Z
Table 27: Channel Z polarity select
ICHAUS [ IC-HAUS GMBH ]
