CATALYST CAT9555HV6I-T1

CAT9555
16-bit I2C and SMBus I/O Port with Interrupt
FEATURES
DESCRIPTION
■ 400kHz I2C bus compatible*
The CAT9555 is a CMOS device that provides 16-bit
parallel input/output port expansion for I2C and SMBus
compatible applications. These I/O expanders provide
a simple solution in applications where additional I/Os
are needed: sensors, power switches, LEDs,
pushbuttons, and fans.
■ 2.3V to 5.5V operation
■ Low stand-by current
■ 5V tolerant I/Os
■ 16 I/O pins that default to inputs at power-up
The CAT9555 consists of two 8-bit Configuration ports
(input or output), Input, Output and Polarity inversion
registers, and an I2C/SMBus-compatible serial interface.
■ High drive capability
■ Individual I/O configuration
■ Polarity inversion register
Any of the sixteen I/Os can be configured as an input or
output by writing to the configuration register. The system
master can invert the CAT9555 input data by writing to
the active-high polarity inversion register.
■ Active low interrupt output
■ Internal power-on reset
■ No glitch on power-up
■ Noise filter on SDA/SCL inputs
The CAT9555 features an active low interrupt output
which indicates to the system master that an input state
has changed.
■ Cascadable up to 8 devices
■ Industrial temperature range
The three address input pins provide the device's
extended addressing capability and allow up to eight
devices to share the same bus. The fixed part of the I2C
slave address is the same as the CAT9554, allowing up
to eight of these devices in any combination to be
connected on the same bus.
■ RoHS-compliant 24-lead SOIC and TSSOP, and
24-pad TQFN (4 x 4 mm) packages
APPLICATIONS
■ White goods (dishwashers, washing machines)
■ Handheld devices (cell phones, PDAs, digital
cameras)
■ Data Communications (routers, hubs and
For Ordering Information details, see page 16.
servers)
BLOCK DIAGRAM
A0
I/O1.0
A1
I/O1.1
I/O1.2
A2
8-BIT
INPUT/
OUTPUT
PORTS
I/O1.3
I/O1.4
I/O1.5
WRITE pulse
I/O1.6
READ pulse
I/O1.7
I2C/SMBUS
CONTROL
I/O0.0
I/O0.1
I/O0.2
SCL
SDA
INPUT
FILTER
8-BIT
INPUT/
OUTPUT
PORTS
I/O0.3
I/O0.4
WRITE pulse
I/O0.5
READ pulse
I/O0.6
I/O0.7
VCC
VCC
VINT
POWER-ON
RESET
LP FILTER
~
INT
NOTE: ALL I/Os ARE SET TO INPUTS AT RESET
* Catalyst Semiconductor is licensed by Philips Corporation to carry the I2C Bus Protocol.
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 8551, Rev. E
CAT9555
PIN CONFIGURATION
19 SCL
20 SDA
21 VCC
22 INT
23 A1
TQFN (HV6)
24 A2
SOIC (W) / TSSOP (Y)
22
SCL
I/O0.0 1
18 A0
I/O0.0
4
21
A0
I/O0.1 2
17 I/O1.7
I/O0.1
5
20
I/O1.7
I/O0.2
6
19
I/O1.6
I/O0.2 3
16 I/O1.6
I/O0.3
7
19
I/O1.5
I/O0.4
8
17
I/O1.4
I/O0.3 4
15 I/O1.5
I/O0.5
9
16
I/O1.3
I/O0.4 5
14 I/O1.4
I/O0.6
10
15
I/O1.2
I/O0.7
11
14
I/O1.1
I/O0.5 6
13 I/O1.3
VSS
12
13
I/O1.0
I/O1.2 12
3
I/O1.1 11
SDA
A2
I/O1.0 10
VCC
23
VSS 9
24
2
I/O0.7 8
1
A1
I/O0.6 7
INT
4 x 4 mm
Top View
PIN DESCRIPTION
SOIC / TSSOP
TQFN
PIN NAME
1
22
INT
2
23
A1
Address Input 1
3
24
A2
Address Input 2
4-11
1-8
I/O0.0 - I/O0.7
12
9
VSS
13-20
10-17
I/O1.0 - I/O1.7
21
18
A0
22
19
SCL
Serial Clock
23
20
SDA
Serial Data
24
21
VCC
Power Supply
Doc. No. 8551, Rev. E
2
FUNCTION
Interrupt Output (open drain)
I/O Port 0.0 to I/O Port 0.7
Ground
I/O Port 1.0 to I/O Port 1.7
Address Input 0
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT9555
ABSOLUTE MAXIMUM RATINGS(1)
VCC with Respect to Ground ............... –0.5V to +6.5V
VSS Supply Current .......................................... 200mA
Voltage on Any Pin with
Respect to Ground ........................ –0.5V to +5.5V
Package Power Dissipation
Capability (TA = 25°C) ................................... 1.0W
DC Current on I/O0 to I/O7 ........................................... +50 mA
Junction Temperature ..................................... +150°C
DC Input Current ............................................. +20 mA
Storage Temperature ........................ -65°C to +150°C
VCC Supply Current .......................................... 160mA
RELIABILITY CHARACTERISTICS
Symbol
Parameter
Reference Test Method
Min
Units
VZAP(2)
ESD Susceptibility
JEDEC Standard JESD22
2000
Volts
ILTH(2)
Latch-up
JEDEC JESD78A
100
mA
Notes:
(1) Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this
specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability.
(2) This parameter is tested initially and after a design or process change that affects the parameter.
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
3
Doc. No. 8551, Rev. E
CAT9555
D.C. OPERATING CHARACTERISTICS
VCC = 2.3 to 5.5 V; VSS = 0V; TA = -40°C to +85°C, unless otherwise specified
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
2.3
—
5.5
V
Operating mode; VCC = 5.5 V; no load; fSCL = 100
kHz
—
135
200
µA
Supplies
VCC
Supply voltage
ICC
Supply current
Istbl
Standby current
Standby mode; VCC = 5.5 V; no load; VI = VSS;
fSCL = 0 kHz; I/O = inputs
—
1.1
1.5
mA
Istbh
Standby current
Standby mode; VCC = 5.5 V; no load; VI = VCC;
fSCL = 0 kHz; I/O = inputs
—
0.75
1
µA
No load; VI = VCC or VSS
—
1.5
1.65
V
-0.5
—
0.3 VCC
V
VPOR
Power-on reset voltage
SCL, SDA, INT
VIL (1)
Low level input voltage
VIH (1)
High level input voltage
IOL
Low level output current
0.7 VCC
—
5.5
V
VOL = 0.4V
3
—
—
mA
VI = VCC = VSS
– 1
—
+1
µA
IL
Leakage current
CI (2)
Input capacitance
VI = VSS
—
—
6
pF
CO (2)
Output capacitance
VO = VSS
—
—
8
pF
A0, A1, A2
VIL(1)
Low level input voltage
-0.5
—
0.3 VCC
V
VIH(1)
High level input voltage
0.7 VCC
—
5.5
V
-1
—
1
µA
ILI
Input leakage current
I/Os
VIL
Low level input voltage
-0.5
—
0.3 VCC
V
VIH
High level input voltage
0.7 VCC
—
5.5
V
8
8 to 20
—
mA
IOL
Low level output current
VOL = 0.7 V; VCC = 2..3 V to 5.5 V (3)
10
10 to 24
—
mA
IOH = – 8 mA; VCC = 2.3 V; (4)
1.8
—
—
V
IOH = – 10 mA; VCC = 2.3 V; (4)
1.7
—
—
V
IOH = – 8 mA; VCC = 3.0 V; (4)
2.6
—
—
V
IOH = – 10 mA; VCC = 3.0 V; (4)
2.5
—
—
V
IOH = – 8 mA; VCC = 4.75 V; (4)
4.1
—
—
V
IOH = – 10 mA; VCC = 4.75 V; (4)
4.0
—
—
V
VCC = 3.6 V; VI = VCC
—
—
1
µA
VOH
IIH
IIL
VOL = 0.5 V; VCC = 2..3 V to 5.5 V (3)
High level output voltage
Input leakage current
—
—
-100
µA
CI (2)
Input capacitance
Input leakage current
VCC = 5.5 V; VI = VSS
—
—
5
pF
CO (2)
Output capacitance
—
—
8
pF
Notes:
1. VIL min and VIH max are reference values only and are not tested.
2. This parameter is characterized initially and after a design or process change that affects the parameter. Not 100% tested.
3. Each I/Os must be externally limited to a maximum of 25 mA and each octal (I/O0.0 to I/O0.7 and I/O1.0 to I/O1.7) must be limited to a
maximum current of 100 mA for a device total of 200 mA.
4. The total current sourced by all I/Os must be limited to 160 mA.
Doc. No. 8551, Rev. E
4
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT9555
A.C. CHARACTERISTICS
VCC = 2.3V to 5.5V, TA = -40°C to +85°C, unless otherwise specified (Note 1).
Symbol
Parameter
Min
Max
Units
fSCL
Clock Frequency
400
kHz
tSP
Input Filter Spike Suppression (SDA, SCL)
50
ns
tLOW
Clock Low Period
1.3
µs
tHIGH
Clock High Period
0.6
µs
SDA and SCL Rise Time
20
300
ns
SDA and SCL Fall Time
20
300
ns
tHD:STA
Start Condition Hold Time
0.6
µs
tSU:STA
Start Condition Setup Time (for a Repeated Start)
0.6
µs
tHD:DAT
Data Input Hold Time
0
ns
tSU:DAT
Data In Setup Time
100
ns
tSU:STO
Stop Condition Setup Time
0.6
µs
tAA
SCL Low to Data Out Valid
tDH
Data Out Hold Time
50
ns
Time the Bus must be Free Before a New Transmission Can Start
1.3
µs
(2)
tR
(2)
tF
(2)
tBUF
900
ns
Port Timing
tPV
Output Data Valid
tPS
Input Data Setup Time
100
ns
tPH
Input Data Hold Time
1
µs
200
ns
Interrupt Timing
tIV
Interrupt Valid
4
µs
tIR
Interrupt Reset
4
µs
Notes:
1. Test conditions according to "AC Test Conditions" table.
2. This parameter is characterized initially and after a design or process change that affects the parameter. Not 100% tested.
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc. No. 8551, Rev. E
CAT9555
AC TEST CONDITIONS
Input Rise and Fall time
< = 10ns
CMOS Input Voltages
0.2VCC to 0.8VCC
CMOS Input Reference Voltages
0.3VCC to 0.7VCC
Output Reference Voltages
0.5VCC
Output Load: SDA, INT
Current Souce IOL = 3mA; CL = 100pF
Output Load: I/Os
Current Source: IOL/IOH = 10mA; CL = 50pF
tF
tHIGH
tLOW
tR
tLOW
SCL
tSU:STA
tHD:STA
tHD:DAT
tSU:DAT
tSU:STO
SDA IN
tAA
tDH
tBUF
SDA OUT
Figure 1. 2-Wire Serial Interface Timing
Doc. No. 8551, Rev. E
6
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT9555
PIN DESCRIPTION
A0, A1, A2: Device Address Inputs
The serial clock input clocks all data transferred into or
out of the device. The SCL line requires a pull-up resistor
if it is driven by an open drain output.
These inputs are used for extended addressing capability. The A0, A1, A2 pins should be hardwired to VCC or
VSS. When hardwired, up to eight CAT9555s may be
addressed on a single bus system. The levels on these
inputs are compared with corresponding bits, A2, A1,
A0, from the slave address byte.
SDA: Serial Data/Address
I/O 0.0 to I/O 0.7, I/O 1.0 to I/O 1.7: Input / Output Ports
The bidirectional serial data/address pin is used to
transfer all data into and out of the device. The SDA pin
is an open drain output and can be wire-ORed with other
open drain or open collector outputs. A pull-up resistor
must be connected from SDA line to VCC. The value of
the pull-up resistor, Rp, can be calculated based on
minimum and maximum values from Figure 2 and Figure
3 (see Note).
Any of these pins may be configured as input or output.
The simplified schematic of I/Os is shown in Figure 4.
When an I/O is configured as an input, the Q1 and Q2
output transistors are off creating a high impedance
input with a weak pull-up resistor (typical 100 kohm). If
the I/O pin is configured as an output, the push-pull
output stage is enabled. Care should be taken if an
external voltage is applied to an I/O pin configured as an
output due to the low impedance paths that exist between the pin and either VCC or VSS.
SCL: Serial Clock
8.00
RP max (Kohm)
RP min (Kohm)
2.5
2
1.5
1
0.5
0
7.00
6.00
5.00
4.00
3.00
2.00
1.00
0.00
2
2.4
2.8
3.2
3.6
4
4.4
4.8
5.2
50
5.6
VCC (V)
100
150
200
250
300
350
400
CBUS (pF)
Figure 2. Minimum Rp as a Function of Supply
Voltage (IOL = 3mA @ VOL max)
Figure 3. Maximum Rp Value versus Bus
Capacitance (Fast Mode I2C Bus / tr max = 300ns)
Note: According to the Fast Mode I2C bus specification, for bus capacitance up to 200pF, the pull up device
can be a resistor. For bus loads between 200pF and 400pF, the pull-up device can be a current source
(Imax = 3mA) or a switched resistor circuit.
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
7
Doc. No. 8551, Rev. E
CAT9555
INT
INT: Interrupt Output
The open-drain interrupt output is activated when one of
the port pins configured as an input changes state
(differs from the corresponding input port register bit
state). The interrupt is deactivated when the input returns
to its previous state or the input port register is read.
Data from
Shift Register
Data from
Shift Register
Since there are two 8-bit ports that are read independently,
the interrupt caused by Port 0 will not be cleared by a
read of Port 1, or vice versa.
Changing an I/O from an output to and input may cause
a false interrupt if the state of the pin does not match the
contents of the input port register.
Output Port
Register Data
Configuration
Register
D
Q
VCC
FF
Write
Configuration Pulse
CK
Q1
Q
D
Q
FF
I/O Pin
Write Pulse
CK
Q
Output Port
Register
Q2
Input Port
Register
D
Q
LATCH
Read Pulse
Data from
Shift Register
VSS
Input Port
Register Data
CK
Q
To INT
D
Q
Polarity
Register Data
FF
Write
Polarity
Register
CK
Q
Polarity
Inversion Register
Figure 4. Simplified Schematic of I/Os
Doc. No. 8551, Rev. E
8
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT9555
FUNCTIONAL DESCRIPTION
START and STOP Conditions
The CAT9555 general purpose input/output (GPIO)
peripheral provides up to sixteen I/O ports, controlled
through an I2C compatible serial interface
The START Condition precedes all commands to the
device, and is defined as a HIGH to LOW transition of
SDA when SCL is HIGH. The CAT9555 monitors the
SDA and SCL lines and will not respond until this
condition is met.
The CAT9555 supports the I2C Bus data transmission
protocol. This Inter-Integrated Circuit Bus protocol defines
any device that sends data to the bus to be a transmitter
and any device receiving data to be a receiver. The
transfer is controlled by the Master device which
generates the serial clock and all START and STOP
conditions for bus access. The CAT9555 operates as a
Slave device. Both the Master device and Slave device
can operate as either transmitter or receiver, but the
Master device controls which mode is activated.
A LOW to HIGH transition of SDA when SCL is HIGH
determines the STOP condition. All operations must end
with a STOP condition.
Device Addressing
After the bus Master sends a START condition, a slave
address byte is required to enable the CAT9555 for a
read or write operation. The four most significant bits of
the slave address are fixed as binary 0100 (Figure 6).
The CAT9555 uses the next three bits as address bits.
I2C Bus Protocol
The features of the I2C bus protocol are defined as
follows:
The address bits A2, A1 and A0 are used to select which
device is accessed from maximum eight devices on the
same bus. These bits must compare to their hardwired
input pins. The 8th bit following the 7-bit slave address
is the R/W bit that specifies whether a read or write
operation is to be performed. When this bit is set to “1”,
a read operation is initiated, and when set to “0”, a write
operation is selected.
(1) Data transfer may be initiated only when the bus
is not busy.
(2) During a data transfer, the data line must remain
stable whenever the clock line is high. Any
changes in the data line while the clock line is high
will be interpreted as a START or STOP condition
(Figure 5).
Following the START condition and the slave address
byte, the CAT9555 monitors the bus and responds with
an acknowledge (on the SDA line) when its address
matches the transmitted slave address. The CAT9555
then performs a read or a write operation depending on
the state of the R/W bit.
SCL
SDA
START
CONDITION
STOP
CONDITION
Figure 5. Start/Stop Timing
SLAVE ADDRESS
1
1
0
FIXED
0
A2
A1
A0
R/W
PROGRAMMABLE
HARDWARE
SELECTABLE
Figure 6. CAT9555 Slave Address
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
9
Doc. No. 8551, Rev. E
CAT9555
The command byte is the first byte to follow the device
address byte during a write/read bus transaction. The
register command byte acts as a pointer to determine
which register will be written or read.
Acknowledge
After a successful data transfer, each receiving device
is required to generate an acknowledge. The
acknowledging device pulls down the SDA line during
the ninth clock cycle, signaling that it received the 8 bits
of data. The SDA line remains stable LOW during the
HIGH period of the acknowledge related clock pulse
(Figure 7).
The input port register is a read only port. It reflects the
incoming logic levels of the I/O pins, regardless of
whether the pin is defined as an input or an output by the
configuration register. Writes to the input port register
are ignored.
The CAT9555 responds with an acknowledge after
receiving a START condition and its slave address. If
the device has been selected along with a write operation,
it responds with an acknowledge after receiving each
data byte.
Table 2. Registers 0 and 1 – Input Port Registers
When the CAT9555 begins a READ mode it transmits
8 bits of data, releases the SDA line, and monitors the
line for an acknowledge. Once it receives this
acknowledge, the CAT9555 will continue to transmit
data. If no acknowledge is sent by the Master, the
device terminates data transmission and waits for a
STOP condition. The master must then issue a stop
condition to return the CAT9555 to the standby power
mode and place the device in a known state.
IO.7
IO.6
IO.5
IO.4
IO.3
IO.2
IO.1
IO.0
default
X
X
X
X
X
X
X
X
bit
I1.7
I1.6
I1.5
I1.4
I1.3
I1.2
I1.1
I1.0
default
X
X
X
X
X
X
X
X
The default value 'X' is determined by the externally
applied logic lavel
Table 3. Registers 2 and 3 – Output Port Registers
Registers and Bus Transactions
The CAT9555 internal registers and their address and
function are shown in Table 1.
bit
O0.7
O0.6
O0.5
O0.4
O0.3
O0.2
O0.1
O0.0
default
1
1
1
1
1
1
1
1
bit
O1.7
O1.6
O1.5
O1.4
O1.3
O1.2
O1.1
O1.0
default
1
1
1
1
1
1
1
1
Table 4. Registers 4 and 5 – Polarity Inversion
Registers
Table 1. Register Command Byte
Command (hex)
bit
bit
N0.7
N0.6
N0.5
N0.4
N0.3
N0.2
N0.1
N0.0
default
0
0
0
0
0
0
0
0
bit
N1.7
N1.6
N1.5
N1.4
N1.3
N1.2
N1.1
N1.0
default
0
0
0
0
0
0
0
0
Register
0h
Input Port 0
1h
Input Port 1
2h
Output Port 0
3h
Output Port 1
4h
Polarity Inversion Port 0
bit
C0.7
C0.6
C0.5
C0.4
C0.3
C0.2
C0.1
C0.0
5h
Polarity Inversion Port 1
default
1
1
1
1
1
1
1
1
6h
Configuration Port 0
bit
C1.7
C1.6
C1.5
C1.4
C1.3
C1.2
C1.1
C1.0
7h
Configuration Port 1
default
1
1
1
1
1
1
1
1
Table 5. Registers 6 and 7 – Configuration Registers
BUS RELEASE DELAY (TRANSMITTER)
SCL FROM
MASTER
1
8
BUS RELEASE DELAY (RECEIVER)
9
DATA OUTPUT
FROM TRANSMITTER
DATA OUTPUT
FROM RECEIVER
START
ACK SETUP (≥ tSU:DAT)
ACK DELAY (≤ tAA)
Figure 7. Acknowledge Timing
Doc. No. 8551, Rev. E
10
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT9555
The output port register sets the outgoing logic levels of
the I/O ports, defined as outputs by the configuration
register. Bit values in this register have no effect on I/O
pins defined as inputs. Reads from the output port
register reflect the value that is in the flip-flop controlling
the output, not the actual I/O pin value.
The CAT9555 registers are configured to operate at four
register pairs: Input Ports, Output Ports, Polarity Inversion Ports and Configuration Ports. After sending data to
one register, the next data byte will be sent to the other
register in the pair. For example, if the first byte of data
is sent to the Configuration Port 1 (register 7), the next
byte will be stored in the Configuration Port 0 (register 6).
Each 8-bit register may be updated independently of the
other registers.
The polarity inversion register allows the user to invert
the polarity of the input port register data. If a bit in this
register is set (“1”) the corresponding input port data is
inverted. If a bit in the polarity inversion register is
cleared (“0”), the original input port polarity is retained.
Reading the Port Registers
The CAT9555 registers are read according to the timing
diagrams shown in Figure 10 and Figure 11. Data from
the register, defined by the command byte, will be sent
serially on the SDA line. Data is clocked into the register
on the failing edge of the acknowledge clock pulse. After
the first byte is read, additional data bytes may be read,
but the second read will reflect the data from the other
register in the pair. For example, if the first read is data
from Input Port 0, the next read data will be from Input
Port 1. The transfer is stopped when the master will not
acknowledge the data byte received and issue the
STOP condition.
The configuration register sets the directions of the
ports. Set the bit in the configuration register to enable
the corresponding port pin as an input with a high
impedance output driver. If a bit in this register is cleared,
the corresponding port pin is enabled as an output. At
power-up, the I/Os are configured as inputs with a weak
pull-up resistor to VCC.
Writing to the Port Registers
Data is transmitted to the CAT9555 registers using the
write mode shown in Figure 8 and Figure 9.
1
SCL
2
3
4
5
6
7
9
8
command byte
slave address
SDA
S
0
1
0
0
A2 A1 A0
start condition
A
0
R/W
0
0
0
0
0
data to port 0
0
1
acknowledge
from slave
DATA 0
0.7
A
0
data to port 1
0.0
acknowledge
from slave
A 1.7
DATA 1
1.0
acknowledge
from slave
A
P
stop
condition
WRITE TO
PORT
DATA OUT
FROM PORT 0
tpv
DATA OUT
FROM PORT 1
DATA VALID
tpv
Figure 8. Write to Output Port Registers
1
SCL
2
3
4
5
6
7
8
9
1
2
S
0
1
start condition
0
0
A2 A1 A0
4
5
6
7
8
9
1
command byte
slave address
SDA
3
0
R/W
A
0
0
acknowledge
from slave
0
0
0A
1
2
3
4
5
6
7
8
9
1
data to configuration 0
1
0
A MSB
DATA 0
2
3
4
5
data to configuration 1
LSB
acknowledge
from slave
A MSB
DATA 1
LSB A
P
acknowledge
from slave
Figure 9. Write to Configuration Registers
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
11
Doc. No. 8551, Rev. E
CAT9555
Power-On Reset Operation
When the power supply is applied to VCC pin, an internal
power-on reset pulse holds the CAT9555 in a reset state
until VCC reaches VPOR level. At this point, the reset
acknowledge
from slave
slave address
S
0
1
0
0
A2 A1 A0
acknowledge
from slave
COMMAND BYTE
A
0
condition is released and the internal state machine and
the CAT9555 registers are initialized to their default
state.
A
S
slave address
0
0
1
0
acknowledge
from slave
A2 A1 A0
data from lower
or upper byte
of register
DATA
A MSB
1
at this moment master-transmitter
becomes master-receiver and
slave-receiver becomes
slave-transmitter
data from upper
or lower byte of
register
MSB
LSB
A
first byte
R/W
R/W
acknowledge
from master
no acknowledge
from master
LSB NA
DATA
P
NOTE: Transfer can be stopped at any time by a STOP condition.
last byte
Figure 10. Read from Register
SCL
1
2
3
4
5
6
7
8
9
I0.x
S
SDA
0
1
0
0
A2
A1
A0
1
R/W
A
I1.x
DATA 00
ACKNOWLEDGE
FROM SLAVE
A
DATA 10
ACKNOWLEDGE
FROM MASTER
I0.x
A
DATA 03
ACKNOWLEDGE
FROM MASTER
I1.x
A
DATA 12
NON ACKNOWLEDGE
FROM MASTER
READ FROM PORT 0
DATA 00
DATA INTO PORT 0
DATA 01
DATA 02
tph
DATA 03
tps
READ FROM PORT 1
DATA 10
DATA INTO PORT 1
DATA 11
DATA 12
INT
tIV
NOTE:
tIR
Transfer of data can be stopped at any moment by a STOP condition. When this occurs, data present at the latest acknowledge phase is valid (output mode).
It is assumed that the command byte has previously been set to 00 (read input port register).
Figure 11. Read Input Port Register
Doc. No. 8551, Rev. E
12
P
ACKNOWLEDGE
FROM MASTER
tps
tph
1
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT9555
PACKAGE DIMENSIONS
24-LEAD 300MIL WIDE SOIC (W)
E1
E
h x 45
D
C
A
θ1
e
A1
L
b
SYMBOL
MIN
A1
A
b
C
D
E
E1
e
h
L
θ1
0.10
2.35
0.33
0.23
15.20
10.00
7.40
0.25
0.40
0°
NOM
2.49
0.41
0.27
15.40
10.32
7.50
1.27 BSC
0.73
MAX
0.30
2.65
0.51
0.32
15.60
10.65
7.60
0.75
1.27
8°
24-Lead_SOIC_(300mil).eps
For current Tape and Reel information, download the PDF file from:
http://www.catsemi.com/documents/tapeandreel.pdf.
Notes:
1. All dimensions are in millimeters.
2. Complies with JEDEC Standard MS-013
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
13
Doc. No. 8551, Rev. E
CAT9555
24-LEAD TSSOP (Y)
SEE DETAIL A
E
E1
C
D
A2
GAGE PLANE
e
b
A
A1
θ1
L
0.25
L1
DETAIL "A"
SYMBOL
A
A1
A2
b
c
D
E
E1
e
L
L1
θ1
MIN
0.05
0.80
0.19
0.09
7.70
4.30
0.45
NOM
1.00
7.80
6.40 BSC
4.40
0.65 BSC
0.60
1.00 REF
0.00
MAX
1.20
0.15
1.05
0.30
0.20
7.90
4.50
0.75
8.00
For current Tape and Reel information, download the PDF file from:
http://www.catsemi.com/documents/tapeandreel.pdf.
Notes:
1. All dimensions are in millimeters.
2. Complies with JEDEC Standard MO-153
Doc. No. 8551, Rev. E
14
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT9555
24-PAD TQFN (4X4) (HV6)
D2
PIN 1 INDEX AREA
E
E2
L
e
b
D
3xe
A
A3
A1
SYMBOL
MIN
NOM
MAX
A
A1
A3
b
D
D2
E
E2
e
L
0.70
0.00
0.75
0.02
0.20 REF
0.25
4.00
2.50
4.00
2.50
0.50 TYP
0.40
0.80
0.05
0.20
3.95
2.40
3.95
2.40
0.30
0.30
4.05
2.60
4.05
2.60
0.50
TQFN_24-Lead_4X4.eps
For current Tape and Reel information, download the PDF file from:
http://www.catsemi.com/documents/tapeandreel.pdf.
Notes:
1. All dimensions are in millimeters.
2. Complies with JEDEC Standard MO-220
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
15
Doc. No. 8551, Rev. E
CAT9555
ORDERING INFORMATION
Prefix
Device #
CAT
Optional
Company ID
Suffix
9555
W
Product Number
9555
I
Temperature Range
I = Industrial (-40°C to +85°C)
– T1
Tape & Reel
T: Tape & Reel
1: 1000/Reel SOIC Only
2: 2000/Reel
Package
W: SOIC
Y: TSSOP
HV6: TQFN
Notes:
(1) All packages are RoHS-compliant (Lead-free, Halogen-free).
(2) The standard lead finish is Matte-Tin.
(3) The device used in the above example is a CAT9555WI-T1 (SOIC, Industrial Temperature, Matte-Tin, Tape & Reel).
(4) For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office.
Ordering Part Number
Package
Lead Finish
CAT9555WI
SOIC
Matte-Tin
CAT9555WI-T1
SOIC
Matte-Tin
CAT9555YI
TSSOP
Matte-Tin
CAT9555YI-T2
TSSOP
Matte-Tin
CAT9555HV6I
TQFN
Matte-Tin
CAT9555HV6I-T2
TQFN
Matte-Tin
Doc. No. 8551, Rev. E
16
© 2007 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
REVISION HISTORY
Date
12/9/2004
1/7/2005
Rev.
A
B
Reason
Advance Information - Initial Issue
Advance Information - Minor changes
03/11/05
C
Advance Information Edit Features
Edit Ordering Information
09/25/06
D
Initial Release
03/12/07
E
Update Ordering Information: Tape and Reel for SOIC package
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Catalyst Semiconductor reserves the right to make changes to or discontinue any product or service described herein without notice.
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diagrams illustrate typical semiconductor applications and may not be complete.
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Publication #:
Revison:
Issue date:
8551
E
03/12/07