ROHM RPM870-H7

RPM870-H7
Photo Link Module
IrDA wireless communication transceiver
IC (supports Ver. 1.2 Low Power)
RPM870-H7
The RPM870-H7 is an Module that supports IrDA Ver. 1.2 (Low Power), and is ideal for wireless communications.
An infrared LED, a pin-photo diode, and a receiver frequency formation LSI are all contained in a very small single
package. It is also equipped with low power consumption and power down functions making this IC perfect for mobile
sets.
!Features
1) Supports IrDA Ver. 1.2. (Low Power)
2) Low power consumption while standing by for receiving (75µA Typ.).
3) A power-down function is perfect for battery applications.
4) Supports a board power supply voltage range from 2.6V to 3.6V.
5) Only 1 external capacitor required.
!Applications
Mobile phones, PDAs, and others
!Absolute maximum ratings (Ta = 25°C)
Symbol
Limits
Unit
Supply voltage
Parameter
VCC
7.0
V
Input voltage
Vin
−0.3~VCC+0.3
V
°C
Operating temperature
Topr
−20~+85
Storage temperature
Tstg
−30~+100
LED peak current
Ifp
120
Power dissipation
Pd
100
°C
∗1
mA
mW
∗1 LED peak current : <90µsec, on duty < 20%
!Recommended operating conditions (Ta = 25°C)
Parameter
Supply voltage
Symbol
Min.
Typ.
Max.
Unit
VCC
2.6
3.0
3.6
V
VLEDA
2.6
3.0
5.5
V
RPM870-H7
Photo Link Module
!Block diagram and application circuit
AMP
2
1
AMP
GND
NC
VCC
3
VCC
AMP
C1
GND
4
GND
PWDOWN
PWDOWN
5
POWER
DOWN
RXD
6
RXD
TXD
7
TXD
LEDA
8
(LEDVCC)
Recommended values
Part symbol
C1
Recommended value
1µF, tantalum
Ex.) TCFGA1A105M8R (ROHM)
Notice
Bigger capacitance is recommended with much noise from power supply
RPM870-H7
Photo Link Module
!Terminal description
Circuit
Function
Pin No
Terminal
1, 4
GND
2
NC
This terminal must be left open.
VCC
VCC
For preventing from ripple noise.
connect a capacitor between
VCC (3pin) and GND (4pin).
3
GND
VCC
5
Power-down control terminal
H : POWERDOWN
L : OPERATION
CMOS logic level input
When input is L, it will stop
the receiving circuit, Pin-PD
current and transmitting LED operation.
PWDOWN
VCC
Receiving data output terminal
6
CMOS logic level input
When PWDOWN (5pin) = H, the RXD
output will be pulled up to
VCC at approximately 300kΩ.
RXD
VCC
Transmitting data input terminal
7
TXD
200K
H : LED Drive (PWDOWN = L)
CMOS logic level output
Holding TXD = "H"status, LED will
be turn off approximately 48µsec.
LED ANODE terminal
8
LEDA
LED
Other power source can be used
difference between LEDVCC and VCC.
RPM870-H7
Photo Link Module
!Electrical characteristics (Unless otherwise noted, VCC=3V, VLEDVCC=3V, Ta = 25°C)
Symbol
Min.
Typ.
Max.
Unit
Consumption Current 1
Parameter
ICC1
−
75
99
µA
Stand-by for receiving, no input light.
Consumption Current 2
ICC2
PWDOWN = VCC [V] , no input light.
Transmission rate
−
0.01
0.2
µA
2.4
−
115.2
kbps
V
Conditions
PWDOWN INPUT High Voltage
VPDH
VCC−0.5
−
−
PWDOWN INPUT Low Voltage
VPDL
−
−
0.5
V
PWDOWN INPUT High Current
IPDH
−1.0
0
1.0
µA
PWDOWN = VCC [V]
PWDOWN INPUT Low Current
IPDL
−1.0
0
1.0
µA
PWDOWN = 0 [V]
TXD INPUT High Voltage
VTXH
VCC−0.5
−
−
V
TXD INPUT Low Voltage
VTXL
−
−
0.5
V
TXD INPUT High Current
ITXH
7.5
15
30
µA
TXD = VCC [V]
TXD = 0 [V]
<Transmitter>
ITXL
−1.0
0
1.0
µA
LED ANODE Current
ILEDA
−
30.5
−
mA
<Receiver>
RXD OUTPUT High Voltage
VRXH
VCC−0.5
−
−
V
IRXH = −50µA
RXD OUTPUT Low Voltage
VRXL
−
−
0.5
V
IRXL = 200µA
RXD OUTPUT Rise Time
tRR
−
40
−
nsec
CL = 15pF
RXD OUTPUT Fall Time
tFR
−
20
−
nsec
CL = 15pF
twRXD
1.5
2.3
3.6
µsec
CL = 15pF, 2.4~115.2Kbps
tRT
−
100
300
µsec
TXD INPUT Low Current
RXD OUTPUT Pulse Width
Receiver Latency Time
!Optical characteristics (Unless otherwise noted, VCC=3V, VLEDVCC=3V, Ta = 25°C)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Peak wave length
λP
850
870
900
nm
Intensity 1
IE1
4.0
10
26
mW / Sr
−15˚ ≤ θL ≤ 15˚
θL ≤ −30˚, 30˚ ≤ θL
Intensity 2
IE2
−
−
3.6
mW / Sr
Half-Angle
θL / 2
−
±18
−
deg
Rise time / Fall time
Tr / Tf
−
−
100
nsec
−
−
25
%
Edge jitter
Tj
−40
−
40
nsec
Irradiance in angular
Ee
0.0068
−
500
θD / 2
±15
−
−
deg
TLEDmax
16
48
90
µsec
Optical over shoot
INPUT Half-Angular
Maximum Emitting Time
1.This product is not designed for protection against radioactive rays.
2.This product dose not include laser transmitter.
3.This product includes one pin photo diode.
4.This product dose not include optical load.
Conditions
10%~90%
mW / cm2 −15˚ ≤ θL ≤ 15˚
TXD=VCC
RPM870-H7
Photo Link Module
!Timing chart
(Emitting side)
TXD
(7pin)
less than 48 µsec
(emitting)
more than 48 µsec
(emitting)
(emitting)
Internal LED
(Light output)
approximately 48 µsec
(Detecting side)
Light input
less than 2.3 µsec
more than 2.3 µsec
RXD
(6pin)
pull up to VCC at
approximately 300kΩ
approximately 2.3 µsec
PWDOWN
(5pin)
!Notes
1) LEDVCC (8pin) and VCC (3pin)
Other power source can be used difference between LEDVCC and VCC.
2) Caution in designing board lay-out
To get maximum potential from RPM870-H7, please keep in mind following instruction.
The line of RXD (6pin) should be connected at backside via through hole close to RPM870-H7 pin lead. Better not
to be close to photo diode side (1pin).
⇒This is to minimize feedback supplied to photo diode from RXD.
As for C1 between 3-4 pin should be placed close to RPM870-H7.
Better to be placed more than 1.0cm in radius from photo diode (pin1 side) and also away from the parts which
generates noise, such as DC / DC converter.
3) Others
Please be sure to set up the TXD (7pin) input to be “L” (under 0.5V) except transmitting data
(for < 90µsec. on duty < 20%).
Powerdown current might increase if exposed by strong light (ex. direct sunlight) at powerdown mode.
Please use by the signal format which is specified by IrDA Ver1.2 (Low Power). There might be on error if used by
different signal format.
4) Eye Safe
IEC825-1 (EN60825-1) Class 1 Eye Safe.
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RPM870-H7
Photo Link Module
!External dimensions (Units : mm)
φ2
.2
Pin PD
1.1
1.4
2.8
0.15
0.8
0.7
LED
2.55
4.0
8.0
2.9
2.85
R
1
1.
1.
1
R
1
2.2±0.2
1.0
0.15
1.75
φ2
.2
2.9
2.2
P0.95 × 7 = 6.65
0.35
8
RSLP8 (H7)