TH3122KDF MELEXIS [Melexis Microelectronic Systems], TH3122KDF Datasheet - Page 3

• Manufacturer Part Number: TH3122KDF
• Description: K-Bus Transceiver with integrated Voltage Regulator
• Manufacturer: MELEXIS [Melexis Microelectronic Systems]

Functional Description
K-BUS Interface
The BUS Interface builds the connection between the
serial 5V bus line of the protocol controller and the 12V
K-Bus line.
The transceiver consists of a pnp-driver with slew rate
control and fold-back characteristic and contains also in
the receiver a high voltage comparator followed by a
debouncing unit.
Transmit Mode
During the transmission the data at the pin TxD will be
transferred
Figure 3 - Transmit Mode Pulse Diagram
The TH3122 consists of a voltage regulator 5V/100mA
and a K-Bus transceiver, which is a bi-directional bus
interface device for data transfer between K-Bus and the
K-Bus protocol controller.
3901003122
Rev 004
SEN/STA
BUS
TxD
SENSE
to
RxD
TxD
the
pin
ESD
ESD
BUS.
VCC
K-Bus Transceiver with integrated Voltage Regulator
VCC
Figure 2 - Block Diagram K-Bus Transceiver
To
VBAT
POR
POR
VCC
minimize
to Wake-up
Control-
Constant-Low
Bit-Compare
logic
Logic
the
OSC
Page 3
Also integrated into the transceiver are a voltage and
time controlled reset management, power down, wake
up function and a universal comparator for extended
applications.
t
electromagnetic emission of the bus line, the TH3122
has an integrated slew rate control.
Receive Mode
The data at the pin BUS will be transferred to the pin
RxD. Short spikes on the bus signal are suppressed by
the implemented debouncing circuit.
Figure 4 - Receive Mode Pulse Diagram
t
debWake
Biasing
debBUS
Vref
RxD
BUS
V
V
thH
thL
pnp-
Control
- slew rate
- I
- foldback
B
t
debH
t
debL
< t
debH
TH3122
BUS
< t
debL
Dec/04