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PDF TH3122 Data sheet ( Hoja de datos )
| Número de pieza | TH3122 | |
| Descripción | K-Bus Transceiver | |
| Fabricantes | Melexis Microelectronic Systems | |
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Hay una vista previa y un enlace de descarga de TH3122 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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TH3122
K-Bus Transceiver with integrated Voltage Regulator
Features and Benefits
K-Bus Transceiver:
Pin Diagram
SOIC16
PNP-open emitter driver with slew rate control and current limitation
BUS input voltage -24V ... 30V (independently of VS)
VS
EN
VTR
1
2
3
16 VCC
15 SENSE
14 RESET
ISO 9141 and ODBII compliant
Possibility of BUS wake up
Operating voltage VS = 5.5 ... 16 V
www.DataSheetV4eUry.cloomw standby current consumption <100 µ A
GND 4
13 GND
TH3122
GND 5
12 GND
BUS 6
11 TxD
SI 7
10 RxD
SO 8
9 SEN/STA
in normal mode (< 50 µ A in sleep mode)
Linear low drop voltage regulator:
Output voltage 5V± 2%
Output current max. 100mA
Output current limitation
Overtemperature shutdown
Configurable reset time (15ms/100ms) and reset threshold voltage (3.15V / 4.65V)
Low voltage detection at VS
Wake-up by K-BUS traffic and start-up capable independent of EN voltage level
Universal comparator with an input voltage range –24V … 30V and digital output
Load dump protected (40V)
Ordering Information
Part No.
Temperature Code
TH3122
K ( -40ºC to 125ºC )
Package Code
DF ( SOIC16, 300mil )
General Description
The TH3122 consists of a low drop voltage
regulator 5V/100mA and a K-Bus transceiver. The
transceiver is suitable for K-Bus systems conform
to ISO 9141.
The combination of voltage regulator and bus
transceiver in combination with the monitoring
functions make it possible to develop simple, but
powerful and cheap nodes in K-Bus systems.
The wide output current area and the configurable
reset time and reset voltage works together with
many different microcontrollers.
3901003122
Rev 004
Page 1
Dec/04
1 page  
TH3122
K-Bus Transceiver with integrated Voltage Regulator
VS
VCC
RESET
VRESEIN
tRes
VRES1/2
trr
Figure 7 - Initialization
The input EN has an internal pull down resistor. If
EN=high, the internal pull down current is switched off to
minimize the quiescent current.
www.DataShReEeSt4EUT .Ocoumtput
The RESET output is switched from low to high if VS is
switched on and VCC>VRESEIN after the time tRES.
If the voltage VCC drops below VRES1 or VRES2 then the RESET
output is switched from high to low after the time trr has been
reached.
The voltage level for VRES1 and VRES2 and the
corresponding times tRES can be programmed via the
analogue input VTR.
Wake up with BUS traffic
If the regulator is put in standby mode it can be woken
up with the BUS interface. Every pulse on the BUS (high
pulse or low pulse) with a pulse width of min. 45 µ s will
switch on the regulator.
After the BUS has woken up the regulator, it can only be
switched off with a high level followed by a low level on
the EN pin.
Reset Programming on VTR
With the VTR pin the reset switches off levels and delay
time can be programmed.
The voltage on VCC influences the reset function.
VTR-Mode
VTR = GND
VTR = VCC
VTR with R ≥ 50k Ω to GND
VTR with R ≥ 50k Ω to VCC
VRES
VRES = VRES1 = 3.15V
VRES = VRES2 = 4.65V
VRES = VRES1 = 3.15V
VRES = VRES2 = 4.65V
tRes
100ms
100ms
15ms
15ms
VTR-Programming
The voltage on VTR input is read out if the voltage at this
pin is higher than VRESEIN . This value defines the reset
switch off voltage VRES. With the next oscillator cycle it
switches on the pull up current source if VTR=low or the
pull down current source if VTR=high. The sources are
active for one oscillator cycle. The level changes during
this procedure on VTR, which depends on the external
pull up or pull down resistors control the reset time tRes
Temperature Limitation
If the junction temperature 150ºC < Tj < 170ºC the over
temperature recognition will be active and the regulator
voltage and the BUS driver will be switched off. After Tj
falls below 140ºC the TH3122 will be initialized,
independently of the voltage levels on EN and BUS.
The function of the TH3122 is possible between TAmax
and the switch off temperature, but small parameter
differences can appear.
Low Voltage Detection VS
Low voltage on VS is monitored on SENSE output.
If VS has reached the level of VS =6.8V then the SENSE
output generates low level. The normal
operating range is VS > 7.8V and the SENSE output
generates a high level.
Universal Comparator
The TH3122 consist of a universal comparator for
general use. The positive input of this comparator is
connected to the pin SI. The input voltage range of SI is
0V...VS. The input voltage is compared with a fixed
reference voltage at high or low level and the comparator
output SO drives a 5V digital signal.
3901003122
Rev 004
Page 5
Dec/04
5 Page 
Pin Description
www.DataSheet4U.com
TH3122
K-Bus Transceiver with integrated Voltage Regulator
VS 1
16 VCC
EN 2
15 SENSE
VTR 3
14 RESET
GND 4
13 GND
TH3122
GND 5
12 GND
BUS 6
11 TxD
SI 7
SO 8
10 RxD
9 SEN/STA
Pin Name
I/O
Function
1 VS
Supply voltage
2 EN
I Enable Input voltage regulator, HV-pull-down-Input, High-active
3 VTR
I Analogue Input - definition of reset time und Reset voltage level
4 GND
Ground
5 GND
Ground
6 BUS I/O Bi-directional bus line
7 SI
I Comparator Input, HV-Input
8 SO
O 5V-Comparator Output
9 SEN/STA I/O Send status
10 RxD
O Receive Output, 5V-push-pull
11 TxD
I 5V-Transmit Input, pull-up-Input
12 GND
Ground
13 GND
Ground
14 RESET
O 5V-output reset, active low
15 SENSE
O 5V-output of VS-Monitoring
16 VCC
O Regulator output 5V/100mA
3901003122
Rev 004
Page 11
Dec/04
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet TH3122.PDF ] | |
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