MAX14826 Datasheet, PDF (25/32 Pages) Maxim Integrated Products – IO-Link Device Transceiver

MAX14826
IO-Link Device Transceiver
DIOConfig Register [R1, R0] = [1,0]
Bit
Bit Name
Read/Write
POR State
Parallel Pin
Configuration
(SPI/PAR is low)
D7
DoInv
R/W
0
D6
DoAv
R/W
0
D5
DoN/P
R/W
0
D4
DoPP
R/W
0
D3
D2
D1
D0
DoEn
DoBit
LiDis
—
R/W
R/W
R/W
R
0
0
0
0
DOPP and DOPP and
0
0
PNP pins
PNP pins
0
0
0
X
define mode define mode
—_= Register not used.
X = Unknown.
Use the DIOConfig register to control the DI and DO interfaces. All bits in the DIOConfig register are set to 0 at power-
up.
BIT
NAME
DESCRIPTION
DO Output Polarity. Set the DoInv bit to 1 to invert the logic of the DO
D7
DoInv
output. This bit also works in conjunction with the DoAv (Table 6). DO
tracks the TX input with the opposite polarity when both the DoAv and
DoInv bits are set.
DO Antivalent Operation. Set the DoAv bit to 1 to enable antivalent
output operation on DO. DO tracks the TX input (and the Q bit) when
D6
DoAv
DoAv is 1 (Table 6).
The LO input and the DoBit are ignored when the DoAv bit is 1.
DO Driver NPN/PNP Operation. The DoN/P bit selects between low-
side (NPN) and high-side (PNP) modes when the DO driver is configured
D5
DoN/P
as an open-drain output (DoPP = 0). Set DoN/P to 1 to configure the
driver for low-side (NPN) operation. Set DoN/P to 0 for high-side (PNP)
operation.
DO Driver Push-Pull Operation. Set the DoPP bit to 1 to configure the
D4
DoPP
DO driver output for push-pull operation. DO is an open-drain output
when DoPP is 0.
D3
DoEn
DO Driver Enable/Disable. Set the DoEn bit to 1 to enable the DO driver.
The DO driver is high-impedance with a weak pulldown when DoEn is 0.
DO Driver Output Logic. The DoBit bit can be used to program the
D2
DoBit
DO output driver through software. Drive LO high to activate DoBit
programming (Figure 10). The DO output state is given in Table 7. Note
that Table 7 assumes that the DoInv bit is 0.
D1
LiDis
LI Output Enable/Disable. Set the LiDis bit to 1 to disable the LI output.
The LI output is low when LiDis is 1.
D0
—
This bit is not used.
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