Cirrus Logic, Inc. 1997

Cirrus Logic, Inc.
P.O. Box 17847, Austin, Texas 78760
(512) 445 7222 FAX: (512) 445 7581
http://www.cirrus.com

11/6/97

CS8130 Revision G Addendum

Multi-Standard Infrared Transceiver (DS134PP2, JUN `97)

The following items represent permanent changes to the specification of the CS8130 IR transceiver.

1) The Silicon Revision Register (Register 28) reads 0010, indicating rev G silicon.

2) The default receive sensitivity setting is changed to 00011 (Register 6 resets to 0011).

3) Oscillator low power mode is now the default condition after reset (Register 21 resets to 0100).

4) The BLKR bit (Register 4, bit D2) blocks the RXD output data during those periods when the transmit

LEDs are on. This prevents the UART/system reading the transmitted data. The re-enable signal for
the receiver is delayed by 8 µs from when the LEDs are turned off. Set to 1 to block RXD data, set to
0 to allow RXD data through during transmission. This bit goes to 0 upon RESET.

5) An additional control bit was added which causes the CS8130 receiver to ignore the falling edge of the

IR pulse. This bit is called ENPOS, and it is bit D2 of Register #7. ENPOS is normally 1, which causes
the falling edge to be ignored. This results in greater range in IrDA and high-frequency ASK (Sharp
500 kHz) modes. ENPOS should be set to 0 for low-frequency amplitude modulated modes.

6) For IrDA/HP-SIR pulse width modes, two additional control bits have been added:

a. The THIN bit (Register 7, bit D1) allows the minimum acceptable pulse width to be reduced from

1 µs to 0.5 µs when set to 1. This bit has effect only when the receiver is programmed to mode 1a
(fixed 1.6 µs pulses only) or 1c (receive 1.6 µs to 3/16 of a bit cell pulses). This bit resets to 0.

b. The WIDE bit (Register 1, Bit D2) expands the maximum allowable pulse width to 9/16 of a bit

cell when set to 1. This bit has effect only when the receiver is set to mode 1a (fixed 1.6 µs pulses
only).

For normal IrDA operation, it is recommended that THIN be set to 0 and WIDE be set to 1. Under these
conditions, the qualification boundaries for receiver mode 1c (receive 1.6 µs to 3/16 of a bit cell pulses)
are identical to the qualification boundaries for receiver mode 1a (fixed 1.6 µs pulses only). This bit
resets to 1.

7) A TV remote receive mode hesitate bit has been added (Register 1, Bit D3). When this bit is set to 0,

the RXD pin will remain high until the first valid IR signal is detected. At that time, the RXD pin will
output serial data at the specified baud rate until the receiver is disabled (Register 0, bit D1). If this bit
is set to 1, the RXD pin will immediately and continuously output data. This bit resets to 0.

8) The ASK transmit carrier frequency formula has changed:

MD=(3.6864E6/FR)-2 , where MD is the Modulator Divider Value and FR is the desired modulation
frequency (Registers 10 & 11). The RESET default value for MD is now 5, yielding a default carrier

DS134PP2-B

NOV `97

DS134PP2-B

frequency of 527 kHz.

9) ASK Receive Choices - valid incoming frequency range (with RATS = 0 and MD = 5) is 431 kHz to

609 kHz.

10) RATS register control of receive data frequency window period is now:

T(min) ~= [(2*MD)+3+RATS]*135ns
T(max) ~= [(2*MD)+3+(6*(RATS+1))]*135ns

11) Clarification: the IrDA/HP-SIR baud rate can be as low as 1200 bps.

12) Specifications in the following tables replace those found in the JUN '94 CS8130 data sheet

(DS134PP2).

POWER SUPPLY SPECIFICATIONS

= 25 °C; V+ = 3.0 V, Digital Input Levels: Logic 0 = 0 V,

Logic 1 = V+, Note 1)

Notes: 1. Power supply current specifications are with the supply at 3.0 V. For approximate consumption at

+5.0 V, multiply the above currents by 1.667.

2. Oscillator in low power mode; does not include LED current. Subtract oscillator current if using an

external clock to run the CS8130.

3. Floating digital inputs will not cause the power supply to increase beyond the specification.

4. Does not include LED current, does include oscillator current in low power mode.

Parameter

Symbol Min Typ

Max

Unit

Power Supply Voltage

2.7

3.0

5.5

Power Supply Current - All functions enabled

(Note 2)

2.7

3.3

Power Supply Current - All functions disabled

(Note 3)

0.3

µA

Power Supply Current - Receiver only enabled

(Note 2)

2.0

2.8

Power Supply Current - Transmit only enabled

(Note 4)

0.7

1.5

Oscillator Power Supply Current

low power mode:

normal power mode:

-
-

0.45

1.3

1.3
2.2

mA
mA

Data & State Retention Supply Voltage

DS134PP2-B

RECEIVER CHARACTERISTICS

= 25 °C; V+ = 3.0 V, Digital Input Levels: Logic 0 = 0 V,

Logic 1 = V+; unless otherwise specified)

Notes: 5. Typical PIN diode junction capacitance is 70 pF.

6. The temperature coefficient of the receiver threshold setting is low. Current detection thresholds are

above the DC ambient condition. Settings of RS4-0 of less than 00010 are not practical because of
noise. RX threshold settings are roughly linear following the formula:
Threshold (nA) = (RX setting + 1) * 20 + 36.

7. Turn-around time is the time taken for the PIN diode receiver to recover from the IR energy from the

local transmitter. The remote end of the link must wait for this time after receiving data before
transmitting a reply. This time may be reduced to <1 ms by good IR shielding between the transmit LED
to the PIN diode.

TRANSMITTER DRIVER CHARACTERISTICS

= 25 °C; V+ = 3.0 V, Digital Input Levels:

Logic 0 = 0 V, Logic 1 = V+, unless otherwise specified)

Notes: 8. Typical LED junction capacitance is 20 pF.

RECOMMENDED OPERATING CONDITIONS

(All voltages with respect to 0 V)

Parameter

Symbol Min Typ

Max

Unit

Input capacitance

(Note 5)

Input noise current

pA/rtHz

Maximum signal input current from detector

Maximum DC input current (typically sunlight)

100

µA

Input current detection thresholds

(Note 6)

(Programmable with a 5 bit value)

RS4-0 = 00010

RS4-0 = 00011

RS4-0 = 00101

RS4-0 = 00111

RS4-0 = 11111

-
-
-
-
-

114

156
197
724

-
-
-
-
-

nA
nA
nA
nA
nA

Bandpass filter response

High Pass -3dB

Low Pass -3dB

-
-

200
900

-
-

kHz
kHz

Receiver power-up time

With high (100 µA) dc ambient

With normal (2 µA) dc ambient

-
-

0.3

ms
ms

Turn-around time, with receiver on continuously

(Note 7)

Parameter

Symbol Min Typ

Max

Unit

Output Capacitance

(Note 8)

Output rise time (10% to 90%)

Output fall time (90% to 10%)

Overshoot over final current

On resistance

0.8

1.5

Off Leakage current

µA

Parameter

Symbol Min Typ

Max

Unit

Operating Ambient Temperature

°C

Data and State Retention Temperature (In Power Down)

-40

°C

DS134PP2-B

DIGITAL PIN CHARACTERISTICS

= 25 °C; Supply= 3.0 V)

SPEC TABLE TITLE (INSERT 5 COLUMN TABLE)

Spec Table Condition

Notes: 9. 20% duty cycle, max pulse width 19.5 µs (3/16 of (1/9600 bps)).

ABSOLUTE MAXIMUM RATINGS

(All voltages with respect to 0 V)

Notes: 10. In normal oscillator mode, the crystal is internally loaded with 20 pF, which is the standard loading at

which the crystal frequency is tuned. In low power oscillator mode, the internal loading on the crystal is
reduced to approximately 5 pF. The crystal frequency will therefore increase by about 0.03% in low
power mode.

For pricing, delivery, and technical assistance, call (512) 445-7222.

Parameter

Symbol Min Typ

Max

Unit

High-level Input Voltage

2.0

Low-level Input Voltage

0.8

High-level Output Voltage

VD - 0.3

Low-level Output Voltage

0.3

Output Leakage Current in Hi-Z state

0.2

µA

Input Leakage Current

(Digital Inputs)

0.2

µA

Output Capacitance

OUT

Input Capacitance

Parameter

Symbol

Min

Max

Unit

Power Supplies

-0.3

6.0

Input Current

Except Supply Pins & Driver Pins

±10

Input Voltage

-0.3

VD + 0.3

LED Output Current (each driver)

(Note 9)

750

Ambient Temperature

(Power Applied)

-55

+125

°C

Storage Termperature

-65

+150

°C

ESD using humand body model (100 pF with series 1.5 k

)

2000

Parameter

Symbol Min Typ

Max

Unit

XTALIN/EXTCLK frequencies

(Note )

CLKFR pin low

CLKFR pin high

-
-

3.6864
1.8432

-
-

MHz
MHz

EXTCLK duty cycle (as an input)

Crystal Oscillator start up time

Part Number CS8130