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MAX22088
Homebus Transceiver
General Description
Benefits and Features
The MAX22088 Homebus transceiver complies with the
Homebus standard, where data and power are passed
on one single pair of wires, while minimizing the need
for external components. The MAX22088 eliminates the
large external AC-blocking inductor typically required in
bus powered applications and improves the signal quality
to allow for longer cables. Additionally, the MAX22088 fea-
tures an integrated 5V linear regulator to power system
loads up to 70mA (max).
● High Integration Reduces BOM and Footprint
• Eliminates the Need for Large AC-blocking Inductor
• Compact 4mm x 4mm TQFN Package
• Supports External DC-DC Converter for System
Loads More Than 70mA
● Configurability Enables Flexible Design
• Adjustable Receiver Thresholds
• Switched Cable Termination
• Adjustable Slew Rate on Transmit Signals
• Large Receiver Hysteresis
• Data Rates from 9600bps to ≥200kbps
• Dynamic Cable Termination Improves Signal
Quality for High Speed Applications
The MAX22088 supports passing power and data with
speed up to, and exceeding, 200kbps. The MAX22088
features dynamic cable termination to improve the signal
quality for applications with high data rates.
Additional features include adjustable receiver hysteresis,
receiver thresholds and driver slew rate allow the
MAX22088 to be used in a wide variety of systems.
● Integrated Protection for Robust Communication
• IEC 61000-4-2 ±8kV Contact and ±15kV Air-Gap
ESD Protection
• IEC 61000-4-5 ±1kV Surge Protection with Selected
External Components
• -40°C to +105°C Operating Temperature Range
• Thermal Shutdown Protection
Integrated protection (IEC 61000-4-2 ±8kV Contact and
±15kV Air-Gap ESD) ensures robust communication in
harsh industrial environments. The MAX22088 is specified
for operation over the -40°C to +105°C temperature range
and is available in a compact 24-pin 4mm x 4mm TQFN
package.
Ordering Information appears at end of datasheet.
Applications
● HVAC
● Data over Power Applications
● Digital Signage
● Remote Monitoring and Sensing
Simplified Homebus System
18V
POWER
SUPPLY
H+
H-
H+
H-
180k
1μF
100nF
CAPP
HPA
CAPP
HPA
V
1μF
1μF
1μF
1μF
5V FROM
SYSTEM
V
HP
HP
RAW
RAW
100μF
EN
EN
HN
AIO
AIO
CAPN
HNA
HN
CAPN
HNA
R
TRM
100nF
BIO
BIO
R
TRMO
R
TRMO
TERM
TERM
V
V
CC
5V OUTPUT
CC
10μF
1μF
1μF
10μF
GND
GND
MAX22088
MAX22088
(MASTER)
V
V
CC
CC
(REMOTE)
SRA
SRA
TVL
TVT
TVL
TVT
R
SRA
R
SRA
DIN
DIN
Micro-
controller
Micro-
controller
RST
DOUT
RST
DOUT
19-100718; Rev 0; 1/20