Specifications

76 Control and Automation Solutions Guide
Reduce PCB Footprint with IO-Link/Binary
Sensor Interface
MAX14820, MAX14821
The MAX14820 and MAX14821 are transceivers with a 24V binary interface for
sensors and actuators. Designed for IO-Link device applications, they support all
the specied IO-Link data rates. The MAX14820 has a minimum C/Q drive of 300mA,
while the MAX14821 has a minimum drive of 100mA. Both of these devices contain
additional 24V digital inputs and outputs (I/Os). The auxiliary digital output for
the MAX14820 is rated for 135mA minimum current drive, and the MAX14821’s
auxiliary digital output is rated for 100mA. Designers have the option of utilizing
the reverse polarity protected 24V V
P
line for external regulation, or the two built-
in 5V and 3.3V linear regulators for common sensor signal and conditioning power
requirements. The drivers are congurable to pnp, npn, and push-pull. Conguration,
monitoring, and alarms are accessed through an SPI interface. The devices are
thermally self-protected and all 24V interface pins are protected against reverse-
polarity, shorts, and ESD. Both the MAX14820 and MAX14821 are packaged in a
4mm x 4mm TQFN, while the MAX14821 is also oered in a 2.5mm x 2.5mm WLP.
All packages are rated for -40°C to +85°C industrial operating temperature range.
Benefits
• Internal or external power regulation
provides flexibility in design
◦ Reverse polarity-protected 24V V
P
line for powering external regulator
◦ Two built-in regulators of 3.3V and
5V for lower power requirements
• High integration of feature set to
maximize performance and minimize
board space
◦ Wake-up detection alleviates
processing load for microcontroller
◦ High C/Q drive capability for up to
1µF capacitive loads
◦ Dual digital outputs and inputs fit
most sensor needs
◦ SPI interface for configuration and
monitoring
◦ Tiny 2.5mm x 2.5mm WLP
(MAX14821)
◦ Requires minimal external
components
MICROCONTROLLER
V
CC
GPIO1
RTS
TX
RX
IRQ
GND
RX
WU
LO
TXEN
TXC
GND
C/Q
DO
V
CC
LDOINV
5
3.3V
5V
1
2
3
4
L+
L-
DI
LI
1μF
V
L
V33
TXQ
V
P
0.1μF
0.1μF
GPIO2
UV
SDI
SDO
SCLK
SDO
SCLK
SDI
CS CS
10kΩ
MAX14820
0.1μF
The MAX14820 IO-Link/binary-sensor interface reduces PCB footprint.