MAX14890E Datasheet, PDF (22/30 Pages) Maxim Integrated Products – Overvoltage and Undervoltage Fault Detection

MAX14890E
Incremental Encoder Interface for RS-422,
HTL, and TTL with Digital Inputs
Fault and Receiver Status Command
(CMD[2:0] = 010)
Write 010 to bits CMD[2:0] to read the fault and receiver
output status (Figure 10). The fault and receiver status
is latched at the high-to-low transition on HITH/CS of the
following SPI cycle and is output on that SPI cycle. The
_FAULT bits are set when a differential or single-ended
fault occurs on a receiver. See the Fault Diagnostics
section for more information.
SPI COMMAND CYCLE
HITH/CS
SNGL/CLK
TTL/SDI X
0
1
0
X
X
X
X
X
X
X
X
X
X
X
XX
D3FAULT/SDO
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
SPI FOLLOW-ON CYCLE
HITH/CS
SNGL/CLK
TTL/SDI X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
XX
D3FAULT/SDO
X = Don’t care
0
1
0
0 AFAULT BFAULT ZFAULT YFAULT D2FAULT D3FAULT AO
BO
ZO
YO LO2 LO3
Figure 10. Current Fault and Receiver Status Readback SPI Command
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