ETC TOIM3232-TR1

TOIM3232
Vishay Telefunken
Integrated Interface Circuits
ULC Technology:
High-performance gate array package using dual metal layer CMOS technology,
featuring sub-micron channel length (0.8 mm)
Description
The TOIM3232 IC provides proper pulse shaping for
the front end infrared transceivers of the 3000- and
4000-series (3000- and 4000-series devices are infrared transceiver compliant to the IrDA standard
made by Vishay Telefunken), as specified by the IrDA
standard. In the transmit mode, the TOIM3232 shortens the RS232 output signal to IrDA compatible
electrical pulses to drive the infrared. In the receive
mode, the TOIM3232 stretches the received infrared
pulses to the proper bit width at the operating bit rate.
The IrDA bit rate varies between 2.4 kbit/s to
115.2 kbit/s.
The TOIM3232 is using a crystal clock 3.6864 MHz for
its pulse stretching and shortening. The clock can be
generated by the internal oscillator or an external clock
can be used, too. The TOIM3232 is programmable to
operate from 1200 bit/s to 115.2kbit/s by the communication software through the RS232 port. The output
pulses are software programmable as either 1.627 ms
or 3/16 of bit time. The typical power consumption is
very low with about 10 mW in operational state and in
the order of a few microwatts in standby mode.
Features
D Pulse shaping function (shortening and stretching)
D Programmable baud clock generator
used in infrared IrDA standard applications
D Directly interfaces the infrared transceiver
TFDx4xxx series to RS232 port
D
D
(1200 Hz to 115 kHz), 13 baud rates
SO16L package
3 V and 5 V operation
Low operating current
Block Diagram
VCC
Pulse
shaper
TD_232
RD_232
BR/D
Clock
generator
Logic
TD_IR
RD_IR
TD_LED
RD_LED
S1
S2
RESET
Vcc_SD
Oscillator
GND
Figure 1. Block diagram
Document Number 82521
Rev. 1, 01-Apr-99
www.vishay.de • FaxBack +1-408-970-5600
1
TOIM3232
Vishay Telefunken
Pin Assignment and Description
*)
Pin
1
Symbol
RESET
2
BR/ D
3
RD_232
4
TD_232
5
VCC_SD
6
7
8
9
X1
X2
GND
TD_LED
10
RD_LED
11
12
NC
S1
13
S2
14
15
16
TD_IR
RD_IR
VCC
Function
Resets all internal registers. Initially must be HIGH (“1”) to reset internal
registers. When HIGH, the TOIM3232 sets the IrDA default bit rate of
9600, sets pulse width to 1.627 ms. Then the TOIM3232 enters the
front-end (TFDS400) power saving mode by setting VCC_SD low and
therefore switching off the transceiver. When RESET returns to LOW,
the TOIM3232 sets VCC_SD HIGH switching on the front-end device,
and sets the new baud rate in the 1.627 ms pulse width mode. In the
application the RESET pin can be controlled by either the RTS or DTR
line through RS232 level converter. Minimum hold time for reset: 1 ms.
Baud Rate control/ Data.
When BR/ D = 0, RD_232 data is transmitted to the IrDA transmitter pin
TD_IR, while RD_IR is routed to the transmitter pin TD_232. When
BR/ D = 1, data received from the RS232 port is interpreted as the
Control Word. The Control Word programs the baud rate and pulse
width will be effective as soon as BR/ D return to LOW.
Received signal data output of stretched signal to the RS232 port
(using level converter).
Input of the signal to be transmitted from the RS232 port (passing the
level converter).
VCC shutdown output function. This pin can be used to shut down a
transceiver (e.g., TFDx4xxx). Output polarity: Inverted RESET input.
Crystal input clock, 3.6864 MHz nominal. Input for external clock *)
Crystal *)
Ground in common with the RS232 port and IrDA transceiver ground
Transmit LED indicator driver. Use 270 W current limiting resistor in
series to LED to connect to VCC. (VCC = 5 V)
Receive LED indicator driver. Use 270 W current limiting resistor in
series to LED to connect to VCC. (VCC = 5 V)
No connection
User Programmable Bit. Can be used to turn ON/ OFF a front-end
infrared transceiver (e.g., an infrared module at the adapter front)
User Programmable Bit. Can be used to turn ON/ OFF a front-end
infrared transceiver (e.g., an infrared module at the adapter back)
Data output of shortened signal to the infrared transceiver TFDx4xxx
Data input from the infrared transceiver TFDx4xxx
Supply voltage
I/O
I
Active
HIGH
I
O
HIGH
I
HIGH
O
LOW
I
I
O
LOW
O
LOW
O
LOW
O
LOW
O
I
I
HIGH
LOW
Crystal should be connected as shown in figure 2. In addition connect a 100 kW resistor from
Pin 6 to Pin 7 and from Pin 6 and Pin 7 a 22 pF capacitor to ground, respectively. When an
external clock is available connect it to Pin 6 leaving Pin 7 open.
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2
Document Number 82521
Rev. 1, 01-Apr-99
TOIM3232
Vishay Telefunken
Operation Description
Figure 2 shows a typical example of an RS232 port interface. The TOIM3232 connects to an RS232 level
converter on one side, and an infrared transceiver on
the other. Software can be written to program the
TOIM3232 baud rate generator. When BR/D = 0, the
TOIM3232 interprets TD_232 data as data transmitted
to the TFDS4000. On the other hand, whenever
BR/D = 1, the TOIM3232 interprets TD_232 as Control Word. Baud rate can be programmed to operate
from 1200 bit/s to 115 kbit/s. As RS232 level converter, EIA232 or MAX232 or equivalent are
recommended.
Typical external resistors and capacitors are needed
as shown in the TFDx4xxx references.
The output pulse length can be programmed, see
chapter “Operation Description”. To use 1.627 ms output pulses is strongly recommended to save battery
power. A resonator like a Matura Ceramic Resonator
(CERALOCK) CSAC3.68MGC-TC is recommended.
We strongly recommend not to use this 3/16 mode
because 3/16 pulse length at lower bit rates consumes more power than the shorter pulse. At a
data rate of 9600 bit/s, the ratio of power consumption of both modes is a factor of 12 (!).
Features of TOIM3232
The baud rate at which an RS232 serial port communicates with the external adapter is programmable inside
the TOIM3232. This programmable baud rate is especially useful when the baud clock and the UART
oscillator clock are not available and must be regenerated. When BR/D = 0, the TOIM3232 interprets the
signals at TD_232 as transmit and RD_IR as received
data. On the other hand, whenever BR/D = 1, the
TOIM3232 interprets the 7 LSBs at the TD_232 input
as the Control Word. The operating baud rate will
change to its supposedly new baud rate when the
BR/D returns back to LOW (“0”) Set the UART to 8 bit,
no parity, 1 stop bit.
Document Number 82521
Rev. 1, 01-Apr-99
Control Byte (8 bit)
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<––––First char. ––––> <–– – Second char.–––>
X
S2
S1
S0
B3
B2
B1
B0
where
X:
S1, S2:
S0:
B0 .. B3:
Do not care
User programmable bit to program the
outputs S1 and S2
IrDA pulse select
= (1)
1.627 ms output pulses
= (0)
3/16 bit time pulses,
not recommended
Baud rate select words
Baud rate selects, B0 = LSB
Note:
IrDA Standard only supports 2.4, 9.6, 19.2, 38.4, 57.6
and 115.2 kbit/s.
Baud Rate Select Words
Note:
IrDA standard only supports 2.4, 9.6, 19.2, 57.6, and
115.2 kbit/s.
B3
B2
B1
B0
0
0
0
0
0
0
0
0
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
2nd
Char
0
1
2
3
4
5
6
7
8
9
A
B
C
Baud
Rate
115.2 k
57.6 k
38.4 k
19.2 k
14.4 k
12.8 k
9.6 k
7.2 k
4.8 k
3.6 k
2.4 k
1.8 k
1.2 k
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3
TOIM3232
Vishay Telefunken
Software for the TOIM3232
The control word is composed of two characters, written in hexadecimal, in format: YZ.
UART Programming
For proper operation, the RS232 must be programmed
to send a START bit plus an 8 bit data word, YZ and
no STOP bit for every word sent. The transfer rate for
programming must be identical with the formerly programmed data rate, or after resetting the TOIM3232,
the default rate of 9600 bit/s is used.
Software algorithm
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Step
1
RESET
HIGH
BR/D
X
2
3
LOW
LOW
X
HIGH
X
X
4
LOW
HIGH
5
LOW
LOW
*)
RD_UART TD_UART
X
X
RD_IR
X
TD_IR
X
X
X
X
X
X
X
YZ
with Y = 1
for
1.627 ms
Y=0
for 3/16 bit
length
X
X
X
DATA
DATA
DATA
DATA
Comments
Resets all internal registers. Resets
IrDA default data rate of 9600 bit/s.
Wait at least 7 ms.
Wait at least 7 ms.
The TOIM3232 now enters the
Control Word (programming) mode.
Sending the Control Word YZ.
Send ‘1Z’ if 1.627 ms pulses are
used. Otherwise send ‘0Z’ if 3/16 bit
pulses are used. ‘Y6’ keeps the 9.6
kbit/s data rate, whereas the ’0Z’
selects the 3/16 bit length pulses.
Z = 0 sets to 115.2 kbit/s. Wait at
least 1 ms for hold-time.
Data communication between the
TOIM3232 and the RS232 port has
been established by BR/D LOW.
The TOIM3232 now enters the data
transmission mode. Both RESET
and BR/D must be kept LOW (‘0’)
during data mode. Software can
reprogram a new data rate by
restarting from step 3.
The UART also must be set to the
correct data rate *).
For programming the UART, refer to e.g., National Semiconductor’s data sheet of PC 16550 UART.
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4
Document Number 82521
Rev. 1, 01-Apr-99
TOIM3232
Vishay Telefunken
Absolute Maximum Ratings
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DC Characteristics
Parameter
Symbol
VCC
Supply voltage
Input/ output voltage
all pins
Output sinking current
all pins
Junction temperature
Ambient temperature (operating)
Storage temperature
Soldering temperature t = 20 s @ 215°C
VCC = 5 V ± 10% **), operating temperature 0
Iout
Tj
Tamb
Tstg
Tsld
Min.
– 0.5
– 0.5
8
Typ.
Max.
+7
VCC + 0.5
125
70
+ 85
230
0
– 25
215
Unit
V
V
mA
°C
°C
°C
°C
X 70°C
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" ÁÁÁÁ
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Parameter
Input HIGH voltage
Input LOW voltage
Schmitt trigger
Positive threshold
Negative threshold
Input leakage
No pull-up/ down
Output HIGH voltage
Output LOW voltage
Current consumption
Standby
Dynamic
*)
Test Conditions
Symbol
VIH
VIL
Min.
2.2
1.1
VIN = VDD or GND
VT+
VT–
IL
IOH = –3.2 mA
IOL = + 3.2 mA
VOH
VOL
2.4
Inputs grounded, no output load *)
VCC = 5 V, T = 25°C
ISB
IDD
Oscillator inactivated.
**)
Typ.
1
Max.
0.8
Unit
V
V
1.4
5
V
V
mA
0.4
V
V
1
2
mA
mA
Operation at VCC = 3 V is also specified.
For data compare TEMIC Matra MHS ULC
technology data sheet.
Application
RS232
9-pin
connector
Table 1. Recommended Application Circuit Components
Level
converter
TOIM3232
TFDS4000
RESET
DTR
RTS
BR/D
TXD
TD_232
RXD
RD_232
VCC_SD
VCC
TD_IR
TXD
RD_IR
RXD
X1
Component
Recommended
Value
22 pF
22 pF
C1
C2
R1
100 kΩ
Crystal 3.684 MHz
Vishay Part Number
VJ 1206 A 220 J XAMT
VJ 1206 A 220 J XAMT
CRCW–1206–1003–F–RT1
X2
100 k
3.6864 MHz
2 x 22 pF
Figure 2. RS232 Port interface
(external infrared adapter)
Document Number 82521
Rev. 1, 01-Apr-99
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5
TOIM3232
Vishay Telefunken
Recommended Circuit Diagram for Using TOIM3232 and TFDS4500 in IR Adapters at the Serial Port
3
C1 +
VCC
2
+5V
Q4
R13
C2 +
Q2
R2
R6
RxD
D5
1
D6
D7
VB1
R5
1
6
2
7
3
8
4
9
5
RTS
Q1
Q3
D1
R1
D2
R3
RXD
TxD
RTS
TXD
DTR
DTR
1
R9
LED 1
SUB–D 9
LED 2
DO1
DO2
D4
VSS
R18
R17
VSS
VCC
TxD RxD RTS
R12/1
+5V
DTR
R11
R12/2
TOIM3232 U1
1
2
Reset
BR/Data
3
RD 232
4
5
QZ1
6
7
8
R10
C3
C4
VCC
RD IR
TD IR
TD 232
S2
Vcc SD
S1
X1
X2
GND
NC
RD LED
TD LED
When VCC is used,
leave off Jumper.
D8
16
IRED1
15
14
13
12
1
11
2
10
3
9
4
Jumper
+
C5
IRED cathode
IRED anode
Rxd
Vcc
Txd
NC (AGCopt.)
Gnd
Sensitivity
8
7
6
5
U2 TFDS4500
C6
CO1
When VCC SD from U1 is used,
place Jumper and leave off
R11 and C6
R02
IREDO1 IREDO2
IREDO3
+
C02
–10V
TO1
D03
R01
Due to the very limited power to be drawn out of the RS232 port, it is recommended to operate the LEDs for displaying the state of transmission (D3, D4) with lowest possible current or not to use this function without external power
supply. PCB layout, Gerber plots, component list, and control software are available on request.
Figure 3. Discrete solution for the interface to the RS232 port
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6
Document Number 82521
Rev. 1, 01-Apr-99
TOIM3232
Vishay Telefunken
Table 1. Recommended Application Circuit Components
Component
C0
C1
C2
C3
C4
C5
C6
C02
D1
D2
D4
D5
D6
D7
D8
D01
D02
D03
IRED1
IRED01
IRED02
IRED03
Jumper
LED1
LED2
Q1
Q2
Q3
Q4
R0
R1
R2
R3
R5
R6
R9
R10
R11
R12
R13
R17
R18
R02
T01
Recommended Value
100 nF
22 mF, 16 V
47 mF, 16 V
22 pF
22 pF
100 nF
6.8 mF
47 mF, 16 V
MOSFET
220 kΩ
22 kΩ
10 kΩ
22 kΩ
1 kΩ
47 kΩ
5.6 kΩ
100 kΩ
100 Ω
20 Ω
12 kΩ
750 Ω
750 Ω
75 Ω
Document Number 82521
Rev. 1, 01-Apr-99
Vishay Part Number
VJ 1206 Y 104 J XXMT
293D 226X9 016C 2T
293D 476X9 016D 2T
VJ 1206 A 220 J XAMT
VJ 1206 A 220 J XAMT
VJ 1206 Y 104 J XXMT
293D 685X9 016B 2T
293D 476X9 016D 2T
1N4148
1N4148
BZT55C4V7
1N4148
1N4145
BZT55C6V2
BZT55C6V8
1N4148
1N4148
1N4145
TSHF5400
TSHF5400
TSHF5400
TSHF5400
CRCW–1206–000–F–RT1
TLLY4401
TLLG4401
BC817–25
VP 0610 0T
BC815–25
BC817–25
CRCW–1206–2203–F–RT1
CRCW–1206–2202–F–RT1
CRCW–1206–1002–F–RT1
CRCW–1206–2202–F–RT1
CRCW–1206–1001–F–RT1
CRCW–1206–4702–F–RT1
CRCW–1206–5601–F–RT1
CRCW–1206–1003–F–RT1
CRCW–1206–1000–F–RT1
CRCW–1206–20R0–F–RT1
CRCW–1206–1202–F–RT1
CRCW–1206–7500–F–RT1
CRCW–1206–7500–F–RT1
CRCW–1206–75R0–F–RT1
TN0201T
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7
TOIM3232
Vishay Telefunken
Package Information
Package SO16L
10.5
10.1
Dimensions in mm
9.25
8.75
7.5
7.3
2.45
2.25
1.27
0.25
0.10
0.49
0.35
8.89
16
0.3
0.2
10.56
10.15
9
technical drawings
according to DIN
specifications
13011
1
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8
Document Number 82521
Rev. 1, 01-Apr-99
TOIM3232
Vishay Telefunken
Ozone Depleting Substances Policy Statement
It is the policy of Vishay Semiconductor GmbH to
1. Meet all present and future national and international statutory requirements.
2. Regularly and continuously improve the performance of our products, processes, distribution and operating
systems with respect to their impact on the health and safety of our employees and the public, as well as
their impact on the environment.
It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as
ozone depleting substances ( ODSs ).
The Montreal Protocol ( 1987 ) and its London Amendments ( 1990 ) intend to severely restrict the use of ODSs and
forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban
on these substances.
Vishay Semiconductor GmbH has been able to use its policy of continuous improvements to eliminate the use of
ODSs listed in the following documents.
1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively
2 . Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental
Protection Agency ( EPA ) in the USA
3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively.
Vishay Semiconductor GmbH can certify that our semiconductors are not manufactured with ozone depleting
substances and do not contain such substances.
We reserve the right to make changes to improve technical design and may do so without further notice.
Parameters can vary in different applications. All operating parameters must be validated for each customer application
by the customer. Should the buyer use Vishay Telefunken products for any unintended or unauthorized application, the
buyer shall indemnify Vishay Telefunken against all claims, costs, damages, and expenses, arising out of, directly or
indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use.
Vishay Semiconductor GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany
Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423
Document Number 82521
Rev. 1, 01-Apr-99
www.vishay.de • FaxBack +1-408-970-5600
9