TOIM3232
Not for new designs
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
m
m)
Description
The TOIM3232 IC provides proper pulse shaping for
the front end infrared transceivers of the 4000-series
(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
m
s 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)
used in infrared IrDA standard applications
D
Programmable baud clock generator
D
D
(1200 Hz to 115 kHz), 13 baud rates
SO16L package
3 V and 5 V operation
Low operating current
D
Directly interfaces the infrared transceiver
TFDx4xxx series to RS232 port
Block Diagram
V
CC
TD_232
RD_232
Pulse
shaper
TD_IR
RD_IR
TD_LED
BR/D
Clock
generator
Logic
RD_LED
S1
S2
RESET
V
CC
_SD
Oscillator
GND
Figure 1. Block diagram
Document Number 82521
Rev. A1.1, 02-Apr-01
www.vishay.com
1 (9)
TOIM3232
Vishay Telefunken
Not for new designs
Pin Assignment and Description
Pin
1
Symbol
RESET
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
m
s. 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
m
s 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
m
s.
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).
V
CC
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 current limiting resistor in
series to LED to connect to V
CC.
(V
CC
= 5 V)
Receive LED indicator driver. Use 270 current limiting resistor in
series to LED to connect to V
CC.
(V
CC
= 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
2
BR/ D
I
3
4
5
6
7
8
9
10
11
12
13
14
15
16
*)
RD_232
TD_232
V
CC
_SD
X1
X2
GND
TD_LED
RD_LED
NC
S1
S2
TD_IR
RD_IR
V
CC
O
I
O
I
I
O
O
HIGH
HIGH
LOW
W
LOW
LOW
W
O
O
O
I
I
LOW
LOW
HIGH
LOW
Crystal should be connected as shown in figure 2. In addition connect a 100 k 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.
W
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2 (9)
Document Number 82521
Rev. A1.1, 02-Apr-01
TOIM3232
Not for new designs
Operation Description
Figure KEIN MERKER 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
m
s
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.
Vishay Telefunken
Control Byte (8 bit)
Document Number 82521
Rev. A1.1, 02-Apr-01
ÁÁÁÁ
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Á Á Á
ÁÁÁ Á
Á
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Á Á ÁÁ Á Á Á
ÁÁÁÁÁ ÁÁ Á Á Á
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ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁ Á Á Á
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
m
s output pulses
= (0)
3/16 bit time pulses,
not recommended
Baud rate select words
First Character
X
S2
S1
S0
Second character
B3
B2
B1
B0
LSB
Baud Rate Select Words
Note:
IrDA standard only supports 2.4, 9.6, 19.2, 57.6, and
115.2 kbit/s.
B3
0
0
0
0
0
0
0
0
1
1
1
1
1
B2
0
0
0
0
1
1
1
1
0
0
0
0
1
B1
0
0
1
1
0
0
1
1
0
0
1
1
0
B0
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 (9)
TOIM3232
Vishay Telefunken
Software for the TOIM3232
The control word is composed of two characters, written in hexadecimal, in format: YZ.
Not for new designs
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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ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
2
3
LOW
LOW
X
HIGH
X
X
X
X
X
X
X
X
4
LOW
HIGH
YZ
with Y = 1
for
1.627
m
s
Y=0
for 3/16 bit
length
DATA
X
X
X
5
LOW
LOW
DATA
DATA
DATA
*)
For programming the UART, refer to e.g., National Semiconductor’s data sheet of PC 16550 UART.
www.vishay.com
4 (9)
Document Number 82521
Rev. A1.1, 02-Apr-01
Step
1
RESET
HIGH
BR/D
X
RD_UART TD_UART
X
X
RD_IR
X
TD_IR
X
Comments
Resets all internal registers. Resets
IrDA default data rate of 9600 bit/s.
Wait at least 7
m
s.
Wait at least 7
m
s.
The TOIM3232 now enters the
Control Word (programming) mode.
Sending the Control Word YZ.
Send ‘1Z’ if 1.627
m
s 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
m
s 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 *).
TOIM3232
Not for new designs
Absolute Maximum Ratings
Vishay Telefunken
Min.
– 0.5
– 0.5
8
0
– 25
Typ.
Max.
+7
V
CC
+ 0.5
125
70
+ 85
230
Unit
V
V
mA
°C
°C
°C
°C
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Á
Á Á
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ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á Á Á
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
I
out
T
j
T
amb
T
stg
T
sld
215
Parameter
Symbol
V
CC
DC Characteristics
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
V
CC
= 5 V
±
10% **), operating temperature 0
X
70°C
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Á Á Á Á Á
Á
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0.8
V
IN
= V
DD
or GND
I
OH
= –3.2 mA
I
OL
= + 3.2 mA
V
T+
V
T–
I
L
1.1
Test Conditions
Symbol
V
IH
V
IL
Min.
2.2
Typ.
Max.
Unit
V
V
V
V
m
A
V
V
"
1
"
1.4
5
V
OH
V
OL
I
SB
I
DD
2.4
0.4
1
Inputs grounded, no output load *)
V
CC
= 5 V, T = 25°C
m
A
2
mA
*)
Oscillator inactivated.
**)
Operation at V
CC
= 3 V is also specified. For data compare TEMIC Matra MHS ULC technology data sheet.
Application
RS232 9 pin
connector
DTR
RTS
TxD
RxD
Level
converter
Table 1. Recommended Application Circuit Components
TOIM3232
RESET
BR/D
TD_232
RD_232
X1
100 k
X2
VCC_SD
TD_IR
RD_IR
TFDS4000
VCC
TxD
RxD
Compo-
nent
C1
C2
R1
100 kΩ
Crystal 3.684 MHz
Recom-
mended
Value
22 pF
22 pF
Vishay Part Number
VJ 1206 A 220 J XAMT
VJ 1206 A 220 J XAMT
CRCW–1206–1003–F–RT1
3.6864 MHz
2 x 22 pF
Figure 2. RS232 Port interface
(external infrared adapter)
Document Number 82521
Rev. A1.1, 02-Apr-01
www.vishay.com
5 (9)
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