IC-TW28 Datasheet, PDF (38/80 Pages) IC-Haus GmbH – 10-BIT SIN/COS INTERPOLATOR

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Rev D2, Page 38/80
MAIN_CFG
MAIN_CFG.input configures the input stage of the sin/-
cos inputs.
Value
0
1
2
3
MAIN_CFG.input (0x0000 Bits 1:0)
Description
Low range signals (0 dB)
Low range signals with sensor loss detection
High range signals (-9 dB) with sensor loss detection
Reserved (do not use)
Table 30: Input Stage Configuration
See Input Configuration and Signal Levels on page 55
for more information.
Normally, the xIRQ output is push-pull. In multidevice
chained applications, the xIRQ output can be set to
open-drain to allow wire-ORing multiple iC-TW28 xIRQ
outputs using a pull-up resistor. See Chaining Multiple
iC-TW28s on page 76 for more information.
MAIN_CFG.elinkoff disables the Encoder Link inter-
face.
Value
0
1
MAIN_CFG.elinkoff (0x0000 Bit 5)
Description
Encoder Link interface available
Encoder Link interface disabled
Table 34: Encoder Link Interface Disable
MAIN_CFG.noise selects the amount of noise filtering
applied to the input signals, which also affects the la-
tency of the iC-TW28.
Value
0
1
MAIN_CFG.noise (0x0000 Bit 2)
Description
Less filtering, 1.5 µs latency
More filtering, 1.9 µs latency
When MAIN_CFG.elinkoff = 1, the Encoder Link inter-
face cannot be activated by the sequence shown in
Figure 24. Set MAIN_CFG.elinkoff = 1 when operating
in SPI Only or ABZUVW output modes. See Output
Modes, Directions, and Polarities on page 56 for more
information.
Table 31: Input Noise Filter
Latency in the amount of time it takes for a change in
the sin/cos inputs to show up in the AB or UVW out-
puts. See Filter Configuration on page 70 for more
information.
MAIN_CFG.rs422 enables and disables the
RS422-compatible line driver on the ABZ/UVW out-
puts.
Value
0
1
MAIN_CFG.rs422 (0x0000 Bit 3)
Description
Line driver disabled (standard digital outputs)
Line driver enabled
Table 32: RS422 Line Driver Enable
When the line driver is disabled, the ABZ/UVW outputs
are standard digital outputs. See Output Modes, Direc-
tions, and Polarities on page 56 for more information.
MAIN_CFG.irqpp determines whether the xIRQ output
is open-drain or push-pull.
Value
0
1
MAIN_CFG.irqpp (0x0000 Bit 4)
Description
xIRQ output is open-drain
xIRQ output is push-pull
Table 33: Interrupt Output Configuration