Application Circuits
Typical Application Circuits
Low-Power Application with Internal LDO Output (57.6kbps)
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MAX22088
MAX22088
Active Inductor Power Output. Bypass VRAW to GND with a 100μF (min) capacitor to drive loads less than 70mA (max). Bypass VRAW to GND with a 200μF (min) capacitor to drive loads more than 70mA (max). See the VRAW Voltage Output section for more information.
VRAW
V
RAW
100μF
100μF
LDO Power Output. Bypass VCC to GND with a 1µF (min) ceramic capacitor as close to the device as possible. VCC is able to supply up to 70mA (max) of current to external loads. See the Internal Voltage Regulator section for more information.
VCC
V
CC
1μF
1μF
10μF
10μF
5V LDO OUTPUT
5V LDO
OUTPUT
Ground Reference. See the Layout Recommendations section for more information.
GND
GND
Slew Rate Adjustment Input. Connect SRA to GND through a resistor to adjust the slew rate of the AIO and BIO transmit edges. See the Transmit Slew Rate Adjustment section for more information.
SRA
SRA
High Pass Filter Enable Input. Connect HPEN to GND to enable the internal high pass filter on receiver input. Connect HPEN to VCC to disable the internal high pass filter. Do not leave HPEN unconnected. See the High Pass Filter section for more information.
HPEN
HPEN
Data Input
DIN
DIN
Bus Reset Control Input. See the RST (Reset) Functionality section for more information.
RST
RST
VLOGIC
V
LOGIC
Open-Drain Data Output. Connect a pullup resistor to the logic voltage supply.
DOUT
DOUT
Trailing Edge Data Threshold. See the Receiver Thresholds section for more information.
TVT
TVT
Leading Edge Data Threshold. See the Receiver Thresholds section for more information.
TVL
TVL
Switched Bus Termination. Connect a resistor between TERM and BIO to adjust Home Bus cable termination for better signal quality. See the Dynamic Cable Termination section for more information.
TERM
TERM
Home Bus Data Input and Output. Connect BIO to Home Bus through an external 2.2μF capacitor in series with a 4.7Ω resistor for 57.6kbps operation. See the Operation of MAX22088 Transceiver section for more information.
BIO
BIO
Home Bus Data Input and Output. Connect AIO to Home Bus through an external 2.2μF capacitor in series with a 4.7Ω resistor for 57.6kbps operation. See the Operation of MAX22088 Transceiver section for more information.
AIO
AIO
82Ω
82Ω
1kΩ
1kΩ
4.7Ω
4.7Ω
4.7Ω
4.7Ω
2.2μF
2.2μF
2.2μF
2.2μF
Power Supply Input from Home Bus. Connect HN to GND when the Active Inductor is not used. See the Power Supply section for more information.
HN
HN
Active Inductor Bypass Capacitor Connection. For 57.6kbps operation, connect a 100nF ceramic capacitor between CAPN and HNA. Connect HNA to CAPN when the Active Inductor is not used.
HNA
HNA
Active Inductor Bypass Capacitor Connection. For 57.6kbps operation, connect a 100nF ceramic capacitor between CAPN and HNA. Connect CAPN to HNA when the Active Inductor is not used. See the Active Inductor section for more information.
CAPN
CAPN
Power Supply Input from Home Bus. Connect HP to VRAW when the Active Inductor is not used. See the Power Supply section for more information.
HP
HP
1Ω
1Ω
24V
24V
H-
H-
H+
H+
HOME BUS
HOME BUS
5.8V
5.8V
5.8V
5.8V
Active Inductor Bypass Capacitor Connection. Connect a 1μF ceramic capacitor in series with a 180kΩ resistor between CAPP and HPA. In parallel, connect an additional 100nF ceramic capacitor between CAPP and HPA for 57.6kbps operation. Connect CAPP to HPA when the Active Inductor is not used. See the Active Inductor section for more information.
CAPP
CAPP
Active Inductor Bypass Capacitor Connection. Connect a 1μF ceramic capacitor in series with a 180kΩ resistor between CAPP and HPA. In parallel, connect an additional 100nF ceramic capacitor between CAPP and HPA for 57.6kbps operation. Connect HPA to CAPP when the Active Inductor is not used.
HPA
HPA
180kΩ
180k
1μF
1μF
LDO Enable Input. Connect EN to VRAW to enable the internal voltage regulator. Connect EN to GND to disable the internal voltage regulator.
EN
EN
62kΩ
62k
100nF
100nF
LDO Power Output. Bypass VCC to GND with a 1µF (min) ceramic capacitor as close to the device as possible. VCC is able to supply up to 70mA (max) of current to external loads. See the Internal Voltage Regulator section for more information.
VCC
V
CC
100nF
100nF
27kΩ
27kΩ
4.3kΩ
4.3kΩ
20kΩ
20kΩ
100kΩ
100kΩ
MICRO CONTROLLER
MICRO
CONTROLLER
Medium-Power Application with External DC-DC Converter (57.6kbps)
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MAX22088
MAX22088
Active Inductor Power Output. Bypass VRAW to GND with a 100μF (min) capacitor to drive loads less than 70mA (max). Bypass VRAW to GND with a 200μF (min) capacitor to drive loads more than 70mA (max). See the VRAW Voltage Output section for more information.
VRAW
V
RAW
LDO Power Output. Bypass VCC to GND with a 1µF (min) ceramic capacitor as close to the device as possible. VCC is able to supply up to 70mA (max) of current to external loads. See the Internal Voltage Regulator section for more information.
VCC
V
CC
1μF
1μF
Ground Reference. See the Layout Recommendations section for more information.
GND
GND
Slew Rate Adjustment Input. Connect SRA to GND through a resistor to adjust the slew rate of the AIO and BIO transmit edges. See the Transmit Slew Rate Adjustment section for more information.
SRA
SRA
Trailing Edge Data Threshold. See the Receiver Thresholds section for more information.
TVT
TVT
Leading Edge Data Threshold. See the Receiver Thresholds section for more information.
TVL
TVL
Switched Bus Termination. Connect a resistor between TERM and BIO to adjust Home Bus cable termination for better signal quality. See the Dynamic Cable Termination section for more information.
TERM
TERM
Home Bus Data Input and Output. Connect BIO to Home Bus through an external 2.2μF capacitor in series with a 4.7Ω resistor for 57.6kbps operation. See the Operation of MAX22088 Transceiver section for more information.
BIO
BIO
Home Bus Data Input and Output. Connect AIO to Home Bus through an external 2.2μF capacitor in series with a 4.7Ω resistor for 57.6kbps operation. See the Operation of MAX22088 Transceiver section for more information.
AIO
AIO
82Ω
82Ω
1kΩ
1kΩ
4.7Ω
4.7Ω
4.7Ω
4.7Ω
2.2μF
2.2μF
2.2μF
2.2μF
Power Supply Input from Home Bus. Connect HN to GND when the Active Inductor is not used. See the Power Supply section for more information.
HN
HN
Active Inductor Bypass Capacitor Connection. For 57.6kbps operation, connect a 100nF ceramic capacitor between CAPN and HNA. Connect HNA to CAPN when the Active Inductor is not used.
HNA
HNA
Active Inductor Bypass Capacitor Connection. For 57.6kbps operation, connect a 100nF ceramic capacitor between CAPN and HNA. Connect CAPN to HNA when the Active Inductor is not used. See the Active Inductor section for more information.
CAPN
CAPN
Power Supply Input from Home Bus. Connect HP to VRAW when the Active Inductor is not used. See the Power Supply section for more information.
HP
HP
1Ω
1Ω
24V
24V
H-
H-
H+
H+
HOME BUS
HOME BUS
5.8V
5.8V
5.8V
5.8V
Active Inductor Bypass Capacitor Connection. Connect a 1μF ceramic capacitor in series with a 180kΩ resistor between CAPP and HPA. In parallel, connect an additional 100nF ceramic capacitor between CAPP and HPA for 57.6kbps operation. Connect CAPP to HPA when the Active Inductor is not used. See the Active Inductor section for more information.
CAPP
CAPP
Active Inductor Bypass Capacitor Connection. Connect a 1μF ceramic capacitor in series with a 180kΩ resistor between CAPP and HPA. In parallel, connect an additional 100nF ceramic capacitor between CAPP and HPA for 57.6kbps operation. Connect HPA to CAPP when the Active Inductor is not used.
HPA
HPA
180kΩ
180k
1μF
1μF
5V DC-DC CONVERTER, OR LDO
5V DC-DC
CONVERTER,
OR LDO
5V OUTPUT
5V
OUTPUT
LDO Enable Input. Connect EN to VRAW to enable the internal voltage regulator. Connect EN to GND to disable the internal voltage regulator.
EN
EN
10μF
10μF
62kΩ
62k
100nF
100nF
100nF
100nF
LDO Power Output. Bypass VCC to GND with a 1µF (min) ceramic capacitor as close to the device as possible. VCC is able to supply up to 70mA (max) of current to external loads. See the Internal Voltage Regulator section for more information.
VCC
V
CC
100μF
100μF
100μF
100μF
High Pass Filter Enable Input. Connect HPEN to GND to enable the internal high pass filter on receiver input. Connect HPEN to VCC to disable the internal high pass filter. Do not leave HPEN unconnected. See the High Pass Filter section for more information.
HPEN
HPEN
Data Input
DIN
DIN
Bus Reset Control Input. See the RST (Reset) Functionality section for more information.
RST
RST
VLOGIC
V
LOGIC
Open-Drain Data Output. Connect a pullup resistor to the logic voltage supply.
DOUT
DOUT
100kΩ
100kΩ
MICRO CONTROLLER
MICRO
CONTROLLER
27kΩ
27kΩ
4.3kΩ
4.3kΩ
20kΩ
20kΩ
Application Where Power is Sourced from Unit (57.6kbps)
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MAX22088
MAX22088
Active Inductor Power Output. Bypass VRAW to GND with a 100μF (min) capacitor to drive loads less than 70mA (max). Bypass VRAW to GND with a 200μF (min) capacitor to drive loads more than 70mA (max). See the VRAW Voltage Output section for more information.
VRAW
V
RAW
LDO Power Output. Bypass VCC to GND with a 1µF (min) ceramic capacitor as close to the device as possible. VCC is able to supply up to 70mA (max) of current to external loads. See the Internal Voltage Regulator section for more information.
VCC
V
CC
1μF
1μF
Ground Reference. See the Layout Recommendations section for more information.
GND
GND
Slew Rate Adjustment Input. Connect SRA to GND through a resistor to adjust the slew rate of the AIO and BIO transmit edges. See the Transmit Slew Rate Adjustment section for more information.
SRA
SRA
Trailing Edge Data Threshold. See the Receiver Thresholds section for more information.
TVT
TVT
Leading Edge Data Threshold. See the Receiver Thresholds section for more information.
TVL
TVL
Switched Bus Termination. Connect a resistor between TERM and BIO to adjust Home Bus cable termination for better signal quality. See the Dynamic Cable Termination section for more information.
TERM
TERM
Home Bus Data Input and Output. Connect BIO to Home Bus through an external 2.2μF capacitor in series with a 4.7Ω resistor for 57.6kbps operation. See the Operation of MAX22088 Transceiver section for more information.
BIO
BIO
Home Bus Data Input and Output. Connect AIO to Home Bus through an external 2.2μF capacitor in series with a 4.7Ω resistor for 57.6kbps operation. See the Operation of MAX22088 Transceiver section for more information.
AIO
AIO
240Ω
240Ω
4.7Ω
4.7Ω
4.7Ω
4.7Ω
2.2μF
2.2μF
2.2μF
2.2μF
Power Supply Input from Home Bus. Connect HN to GND when the Active Inductor is not used. See the Power Supply section for more information.
HN
HN
Active Inductor Bypass Capacitor Connection. For 57.6kbps operation, connect a 100nF ceramic capacitor between CAPN and HNA. Connect HNA to CAPN when the Active Inductor is not used.
HNA
HNA
Active Inductor Bypass Capacitor Connection. For 57.6kbps operation, connect a 100nF ceramic capacitor between CAPN and HNA. Connect CAPN to HNA when the Active Inductor is not used. See the Active Inductor section for more information.
CAPN
CAPN
Power Supply Input from Home Bus. Connect HP to VRAW when the Active Inductor is not used. See the Power Supply section for more information.
HP
HP
5.8V
5.8V
5.8V
5.8V
Active Inductor Bypass Capacitor Connection. Connect a 1μF ceramic capacitor in series with a 180kΩ resistor between CAPP and HPA. In parallel, connect an additional 100nF ceramic capacitor between CAPP and HPA for 57.6kbps operation. Connect CAPP to HPA when the Active Inductor is not used. See the Active Inductor section for more information.
CAPP
CAPP
Active Inductor Bypass Capacitor Connection. Connect a 1μF ceramic capacitor in series with a 180kΩ resistor between CAPP and HPA. In parallel, connect an additional 100nF ceramic capacitor between CAPP and HPA for 57.6kbps operation. Connect HPA to CAPP when the Active Inductor is not used.
HPA
HPA
1μF
1μF
5V FROM SYSTEM
5V FROM
SYSTEM
18V – 24V FROM SYSTEM
18V – 24V FROM
SYSTEM
H-
H-
H+
H+
HOME BUS
HOME BUS
LDO Enable Input. Connect EN to VRAW to enable the internal voltage regulator. Connect EN to GND to disable the internal voltage regulator.
EN
EN
62kΩ
62k
10μF
10μF
LDO Power Output. Bypass VCC to GND with a 1µF (min) ceramic capacitor as close to the device as possible. VCC is able to supply up to 70mA (max) of current to external loads. See the Internal Voltage Regulator section for more information.
VCC
V
CC
28V
28V
28V
28V
High Pass Filter Enable Input. Connect HPEN to GND to enable the internal high pass filter on receiver input. Connect HPEN to VCC to disable the internal high pass filter. Do not leave HPEN unconnected. See the High Pass Filter section for more information.
HPEN
HPEN
Data Input
DIN
DIN
Bus Reset Control Input. See the RST (Reset) Functionality section for more information.
RST
RST
VLOGIC
V
LOGIC
Open-Drain Data Output. Connect a pullup resistor to the logic voltage supply.
DOUT
DOUT
100kΩ
100kΩ
MICRO CONTROLLER
MICRO
CONTROLLER
27kΩ
27kΩ
4.3kΩ
4.3kΩ
20kΩ
20kΩ
100mH
100mH
28V
28V
