PCA9551PW [NXP]
8-bit I2C LED driver with programmable blink rates; 8位I2C LED驱动器,具有可编程闪烁速率型号: | PCA9551PW |
厂家: | NXP |
描述: | 8-bit I2C LED driver with programmable blink rates |
文件: | 总21页 (文件大小:162K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
INTEGRATED CIRCUITS
PCA9551
8-bit I2C LED driver with programmable
blink rates
Product data sheet
2004 Oct 01
Supersedes data of 2003 May 05
Philips
Semiconductors
Philips Semiconductors
Product data sheet
8-bit I2C LED driver with
programmable blink rates
PCA9551
DESCRIPTION
2
The PCA9551 LED Blinker blinks LEDs in I C-bus and SMBus
applications where it is necessary to limit bus traffic or free up the
2
I C Master’s (MCU, MPU, DSP, chipset, etc.) timer. The uniqueness
of this device is the internal oscillator with two programmable blink
rates. To blink LEDs using normal I/O Expanders like the PCF8574
or PCA9554, the bus master must send repeated commands to turn
the LED on and off. This greatly increases the amount of traffic on
2
the I C-bus and uses up one of the master’s timers. The PCA9551
LED Blinker instead requires only the initial set up command to
program BLINK RATE 1 and BLINK RATE 2 (i.e., the frequency and
duty cycle) for each individual output. From then on, only one
command from the bus master is required to turn each individual
open drain output ON, OFF, or to cycle at BLINK RATE 1 or BLINK
RATE 2. Maximum output sink current is 25 mA per bit and 100 mA
per package.
FEATURES
• 8 LED drivers (on, off, flashing at a programmable rate)
• 2 selectable, fully programmable blink rates (frequency and duty
cycle) between 0.148 Hz and 38 Hz (6.74 and 0.026 seconds)
• Input/outputs not used as LED drivers can be used as regular
GPIOs
Any bits not used for controlling the LEDs can be used for General
Purpose Parallel Input/Output (GPIO) expansion.
• Internal oscillator requires no external components
The active-LOW hardware reset pin (RESET) and Power-On Reset
(POR) initializes the registers to their default state, all zeroes,
causing the bits to be set HIGH (LED off).
2
• I C-bus interface logic compatible with SMBus
• Internal power-on reset
• Noise filter on SCL/SDA inputs
• Active-LOW reset input
Three hardware address pins on the PCA9551 allow eight devices
to operate on the same bus.
• 8 open drain outputs directly drive LEDs to 25 mA
• Edge rate control on outputs
• No glitch on power-up
• Supports hot insertion
• Low stand-by current
• Operating power supply voltage range of 2.3 V to 5.5 V
• 0 to 400 kHz clock frequency
• ESD protection exceeds 2000 V HBM per JESD22-A114,
150 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101
• Latch-up testing is done to JESDEC Standard JESD78 which
exceeds 100 mA
• Packages offered: SO16, TSSOP16, HVQFN16
ORDERING INFORMATION
PACKAGES
TEMPERATURE RANGE
ORDER CODE
TOPSIDE MARK
DRAWING NUMBER
16-pin plastic SO
16-pin plastic TSSOP
16-pin plastic HVQFN
–40 °C to +85 °C
–40 °C to +85 °C
–40 °C to +85 °C
PCA9551D
PCA9551PW
PCA9551BS
PCA9551D
PCA9551
9551
SOT109-1
SOT403-1
SOT629-1
Standard packing quantities and other packaging data are available at www.standardproducts.philips.com/packaging.
2
I C is a trademark of Philips Semiconductors Corporation.
2
2004 Oct 01
Philips Semiconductors
Product data sheet
8-bit I2C LED driver with programmable blink rates
PCA9551
PIN CONFIGURATION — SO, TSSOP
PIN CONFIGURATION — HVQFN
A1
A0
V
SDA
DD
A0
A1
1
2
3
4
5
6
7
8
16
V
DD
15 SDA
14 SCL
SCL
12
A2
1
2
3
4
A2
LED0
RESET
LED7
LED0
LED1
LED2
LED3
11
10
9
13 RESET
LED7
12
LED1
LED2
11 LED6
10 LED5
LED6
V
9
LED4
SS
LED3
V
LED4 LED5
SS
SW02039
TOP VIEW
su01667
Figure 1. Pin configuration — SO, TSSOP
Figure 2. Pin configuration — HVQFN
PIN DESCRIPTION
SO, TSSOP
PIN
NUMBER
HVQFN
PIN
NUMBER
SYMBOL
FUNCTION
1
15
A0
Address input 0
Address input 1
Address input 2
LED drivers 0–3
Supply ground
2
16
A1
A2
3
1
4, 5, 6, 7
2, 3, 4, 5
LED0 to LED3
8
6
V
SS
9, 10, 11, 12
7, 8, 9, 10
LED4 to LED7
RESET
SCL
LED drivers 4–7
Active-LOW reset input
Serial clock line
Serial data line
Supply voltage
13
14
15
16
11
12
13
14
SDA
V
DD
3
2004 Oct 01
Philips Semiconductors
Product data sheet
8-bit I2C LED driver with programmable blink rates
PCA9551
BLOCK DIAGRAM
A2
A1
A0
PCA9551
INPUT
REGISTER
SCL
SDA
2
INPUT
FILTERS
I C-BUS
CONTROL
LED SELECT (LSx)
REGISTER
0
1
LEDx
POWER-ON
RESET
V
DD
BLINK0
BLINK1
PWM0
REGISTER
PRESCALER 0
REGISTER
RESET
PWM1
REGISTER
PRESCALER 1
REGISTER
OSCILLATOR
V
SS
NOTE: ONLY ONE I/O SHOWN FOR CLARITY
SW01015
Figure 3. Block diagram
4
2004 Oct 01
Philips Semiconductors
Product data sheet
8-bit I2C LED driver with programmable blink rates
PCA9551
DEVICE ADDRESSING
CONTROL REGISTER DEFINITION
Following a START condition the bus master must output the
address of the slave it is accessing. The address of the PCA9551 is
shown in Figure 4. To conserve power, no internal pull-up resistors
are incorporated on the hardware selectable address pins and they
must be pulled HIGH or LOW.
REGISTER
NAME
REGISTER
FUNCTION
B2
B1
B0
TYPE
INPUT
REGISTER
0
0
0
INPUT
PSC0
PWM0
PSC1
PWM1
LS0
READ
READ/
WRITE
FREQUENCY
PRESCALER 0
0
0
1
SLAVE ADDRESS
READ/
WRITE
PWM
REGISTER 0
0
1
0
1
1
0
0
A2 A1 A0 R/W
READ/
WRITE
FREQUENCY
PRESCALER 1
0
1
1
FIXED
HARDWARE SELECTABLE
READ/
WRITE
PWM
REGISTER 1
su01420
1
0
0
Figure 4. Slave address
The last bit of the address byte defines the operation to be
READ/
WRITE
LED0–LED3
SELECTOR
1
0
1
performed. When set to logic 1 a read is selected while a logic 0
selects a write operation.
READ/
WRITE
LED4–LED7
SELECTOR
1
1
0
LS1
CONTROL REGISTER
REGISTER DESCRIPTION
INPUT — INPUT REGISTER
Following the successful acknowledgement of the slave address,
the bus master will send a byte to the PCA9551 which will be stored
in the Control Register.
LED LED LED LED LED LED LED LED
7
6
5
4
3
2
1
0
bit
7
6
5
4
3
2
1
0
default
X
X
X
X
X
X
X
X
0
0
0
AI
0
B2 B1 B0
The INPUT register reflects the state of the device pins. Writes to
this register will be acknowledged but will have no effect.
REGISTER ADDRESS
AUTO-INCREMENT FLAG
RESET STATE: 00h
NOTE: The default value “X” is determined by the externally applied
logic level, normally ‘1’ when used for directly driving LED with
pull-up to V
.
SW01034
DD
1
PSC0 — FREQUENCY PRESCALER 0
Figure 5. Control register
bit
7
1
6
1
5
1
4
1
3
1
2
1
1
1
0
1
The lowest 3 bits are used as a pointer to determine which register
will be accessed.
default
PSC0 is used to program the period of the PWM output.
If the auto-increment flag is set, the three low order bits of the
Control Register are automatically incremented after a read or write.
This allows the user to program the registers sequentially. The
contents of these bits will rollover to ‘000’ after the last register is
accessed.
(PSC0 ) 1)
The period of BLINK0 +
38
NOTE:
1. Prescaler calculation is different between the PCA9551 and
other PCA955x LED Blinkers. A divider ratio of 38 instead of 44
is used. This different divider ratio causes the blinking frequency
to be 13% (1 – 38/44) lower when the same 8-bit word is used.
The programmed value of the FREQUENCY PRESCALER must
be adjusted to compensate for this difference in applications
where the PCA9551 is used in conjunction with other PCA955x
LED Blinkers and the observed blinking frequencies need to be
the same.
When auto-increment flag is set (AI = 1) and a read sequence is
initiated, the sequence must start by reading a register different from
‘0’ (B2 B1 B0 0 0 0 0)
Only the 3 least significant bits are affected by the AI flag.
Unused bits must be programmed with zeroes.
PWM0 — PWM REGISTER 0
bit
7
1
6
0
5
0
4
0
3
0
2
0
1
0
0
0
default
The PWM0 register determines the duty cycle of BLINK0. The
outputs are HIGH (LED off) when the count is less than the value in
PWM0 and HIGH when it is greater. If PWM0 is programmed with
00h, then the PWM0 output is always LOW.
256 – PWM0
The duty cycle of BLINK0 is:
256
5
2004 Oct 01
Philips Semiconductors
Product data sheet
8-bit I2C LED driver with programmable blink rates
PCA9551
1
PSC1 — FREQUENCY PRESCALER 1
PINS USED AS GENERAL PURPOSE I/Os
LED pins not used to control LEDs can be used as general purpose
I/Os.
bit
7
1
6
1
5
1
4
1
3
1
2
1
1
1
0
1
default
For use as input: Set LEDx to high-impedance (01) and then read
the pin state via the input register.
PSC1 is used to program the period of PWM output.
(PSC1 ) 1)
The period of BLINK1 +
For use as output: Connect external pull-up resistor to the pin and
size it according to the DC recommended operating characteristics.
LED output pin is HIGH when the output is programmed as
high-impedance, and LOW when the output is programmed LOW
through the “LED selector” register. The output can be pulse-width
controlled when PWM0 or PWM1 are used.
38
NOTE:
1. Prescaler calculation is different between the PCA9551 and
other PCA955x LED Blinkers. A divider ratio of 38 instead of 44
is used. This different divider ratio causes the blinking frequency
to be 13% (1 – 38/44) lower when the same 8-bit word is used.
The programmed value of the FREQUENCY PRESCALER must
be adjusted to compensate for this difference in applications
where the PCA9551 is used in conjunction with other PCA955x
LED Blinkers and the observed blinking frequencies need to be
the same.
POWER-ON RESET
When power is applied to V , an internal Power-On Reset holds
DD
the PCA9551 in a reset condition until V has reached V
. At
DD
POR
this point, the reset condition is released and the PCA9551 registers
are initialized to their default states, all the outputs in the off state.
PWM1 — PWM REGISTER 1
bit
7
1
6
0
5
0
4
0
3
0
2
0
1
0
0
0
Thereafter, V must be lowered below 0.2 V to reset the device.
DD
default
EXTERNAL RESET
The PWM1 register determines the duty cycle of BLINK1. The
A reset can be accomplished by holding the RESET pin LOW for a
outputs are LOW (LED off) when the count is less than the value in
PWM1 and HIGH when it is greater. If PWM1 is programmed with
00h, then the PWM1 output is always LOW (LED off).
2
minimum of t . The PCA9551 registers and I C state machine will
W
be held in their default state until the RESET input is once again
HIGH.
256 – PWM1
The duty cycle of BLINK1 is:
256
This input requires a pull-up resistor to V if no active connection is
DD
LS0 — LED0–3 SELECTOR
used.
LED 3
LED 2
LED 1
LED 0
bit
7
6
1
5
4
1
3
2
1
1
0
1
default
0
0
0
0
LS1 — LED4–7 SELECTOR
LED 7 LED 6
LED 5
LED 4
bit
7
6
1
5
0
4
1
3
0
2
1
1
0
0
1
default
0
The LSx LED select registers determine the source of the LED data.
00 = Output is set LOW (LED on)
01 = Output is set Hi-Z (LED off – default)
10 = Output blinks at PWM0 rate
11 = Output blinks at PWM1 rate
6
2004 Oct 01
Philips Semiconductors
Product data sheet
8-bit I2C LED driver with programmable blink rates
PCA9551
2
CHARACTERISTICS OF THE I C-BUS
Start and stop conditions
2
The I C-bus is for 2-way, 2-line communication between different ICs
Both data and clock lines remain HIGH when the bus is not busy. A
HIGH-to-LOW transition of the data line, while the clock is HIGH is
defined as the start condition (S). A LOW-to-HIGH transition of the
data line while the clock is HIGH is defined as the stop condition (P)
(see Figure 7).
or modules. The two lines are a serial data line (SDA) and a serial
clock line (SCL). Both lines must be connected to a positive supply
via a pull-up resistor when connected to the output stages of a device.
Data transfer may be initiated only when the bus is not busy.
System configuration
Bit transfer
A device generating a message is a transmitter: a device receiving
is the receiver. The device that controls the message is the master
and the devices which are controlled by the master are the slaves
(see Figure 8).
One data bit is transferred during each clock pulse. The data on the
SDA line must remain stable during the HIGH period of the clock
pulse as changes in the data line at this time will be interpreted as
control signals (see Figure 6).
SDA
SCL
data line
stable;
data valid
change
of data
allowed
SW00363
Figure 6. Bit transfer
SDA
SDA
SCL
SCL
S
P
START condition
STOP condition
SW00365
Figure 7. Definition of start and stop conditions
SDA
SCL
MASTER
TRANSMITTER/
RECEIVER
SLAVE
TRANSMITTER/
RECEIVER
MASTER
TRANSMITTER/
RECEIVER
2
SLAVE
RECEIVER
I C
MASTER
TRANSMITTER
MULTIPLEXER
SLAVE
SW00366
Figure 8. System configuration
7
2004 Oct 01
Philips Semiconductors
Product data sheet
8-bit I2C LED driver with programmable blink rates
PCA9551
Acknowledge
The number of data bytes transferred between the start and the stop conditions from transmitter to receiver is not limited. Each byte of eight bits
is followed by one acknowledge bit. The acknowledge bit is a HIGH level put on the bus by the transmitter whereas the master generates an
extra acknowledge related clock pulse.
A slave receiver which is addressed must generate an acknowledge after the reception of each byte. Also a master must generate an
acknowledge after the reception of each byte that has been clocked out of the slave transmitter. The device that acknowledges has to pull down
the SDA line during the acknowledge clock pulse, so that the SDA line is stable LOW during the HIGH period of the acknowledge related clock
pulse, set-up and hold times must be taken into account.
A master receiver must signal an end of data to the transmitter by not generating an acknowledge on the last byte that has been clocked out of
the slave. In this event, the transmitter must leave the data line HIGH to enable the master to generate a stop condition.
DATA OUTPUT
BY TRANSMITTER
not acknowledge
DATA OUTPUT
BY RECEIVER
acknowledge
SCL FROM
MASTER
1
2
8
9
S
clock pulse for
acknowledgement
START condition
SW00368
2
Figure 9. Acknowledgement on the I C-bus
8
2004 Oct 01
Philips Semiconductors
Product data sheet
8-bit I2C LED driver with programmable blink rates
PCA9551
Bus transactions
1
2
3
4
5
6
7
8
0
9
SCL
slave address
command byte
data to register
DATA 1
SDA
1
1
0
0
A2 A1 A0
S
A
0
0
0
AI
0
B2 B1 B0
A
A
start condition
R/W acknowledge
from slave
acknowledge
from slave
acknowledge
from slave
WRITE TO
REGISTER
DATA OUT
FROM PORT
DATA 1 VALID
SW01081
t
pv
Figure 10. WRITE to register
acknowledge
from slave
acknowledge
from slave
acknowledge
from slave
acknowledge
from master
slave address
slave address
data from register
0
A2 A1
0
A2 A1
1
1
0
A0
A
0
0
0
AI
0
B2 B1 B0
1
1
0
A0
1
DATA
S
0
A
S
A
A
first byte
R/W
R/W
auto-increment
register address
if AI = 1
at this moment master-transmitter
becomes master-receiver and
slave-receiver becomes
slave-transmitter
no acknowledge
from master
data from register
NA
P
DATA
last byte
SW01082
Figure 11. READ from register
slave address
data from port
data from port
SDA
DATA 1
A
DATA 4
1
1
0
0
A2 A1 A0
S
1
A
NA
P
start condition
R/W acknowledge
from slave
acknowledge
from master
no acknowledge
from master
stop
condition
READ FROM
PORT
DATA INTO
PORT
DATA 1
DATA 2
DATA 3
DATA 4
t
ph
t
ps
SW01084
NOTES:
1. This figure assumes the command byte has previously been programmed with 00h.
Figure 12. READ input port register
9
2004 Oct 01
Philips Semiconductors
Product data sheet
8-bit I2C LED driver with programmable blink rates
PCA9551
APPLICATION DATA
5 V
5 V
10 kΩ
10 kΩ
10 kΩ
V
DD
LED0
LED1
SDA
SCL
SDA
SCL
LED2
LED3
LED4
LED5
LED6
LED7
RESET
2
GPIO
I C/SMBus MASTER
A2
A1
A0
Note: LED0 to LED5 are used as LED drivers
LED6 and LED7 are used as regular GPIOs.
V
SS
PCA9551
Figure 13. Typical application
SW00899
Minimizing I when the I/O is used to control LEDs
DD
When the I/Os are used to control LEDs, they are normally connected to V through a resistor as shown in Figure 13. Since the LED acts as a
DD
diode, when the LED is off the I/O V is about 1.2 V less than V . The supply current, I , increases as V becomes lower than V and is
IN
DD
DD
IN
DD
specified as ∆I in the DC characteristics table.
DD
Designs needing to minimize current consumption, such as battery power applications, should consider maintaining the I/O pins greater than or
equal to V when the LED is off. Figure 14 shows a high value resistor in parallel with the LED. Figure 15 shows V less than the LED supply
DD
DD
voltage by at least 1.2 V. Both of these methods maintain the I/O V at or above V and prevents additional supply current consumption when
IN
DD
the LED is off.
3.3 V
5 V
V
DD
LED
100 kΩ
V
LED
DD
V
DD
LEDx
LEDx
SW02086
SW02087
Figure 14. High value resistor in parallel with the LED
Figure 15. Device supplied by a lower voltage
10
2004 Oct 01
Philips Semiconductors
Product data sheet
8-bit I2C LED driver with programmable blink rates
PCA9551
Programming example
The following example will show how to set LED0 to LED3 on. It will
then set LED4 and LED5 to blink at 1 Hz at a 50% duty cycle. LED6
and LED7 will be set to blink at 4 Hz and at a 25% duty cycle.
Table 1.
2
I C-bus
Start
S
PCA9551 address with A0–A2 = LOW
PSC0 subaddress + auto-increment
Set prescaler PSC0 to achieve a period of 1 second:
C0h
11h
25h
PSC0 ) 1
Blink period + 1 +
38
PSC0 = 37
Set PWM0 duty cycle to 50%:
80h
256 – PWM0
+ 0.5
256
PWM0 = 128
Set prescaler PCS1 to achieve a period of 0.25
seconds:
09h
C0h
PSC1 ) 1
Blink period + 0.25 +
38
PSC1 = 9
Set PWM1 output duty cycle to 25%:
256 – PWM1
+ 0.25
256
PWM1 = 192
Set LED0 to LED3 on
00h
FAh
P
Set LED4 and 5 to PWM0, and LED6 or 7 to PWM1
Stop
11
2004 Oct 01
Philips Semiconductors
Product data sheet
8-bit I2C LED driver with programmable blink rates
PCA9551
ABSOLUTE MAXIMUM RATINGS
In accordance with the Absolute Maximum Rating System (IEC 134)
SYMBOL
PARAMETER
CONDITIONS
MIN
MAX
UNIT
V
V
DD
Supply voltage
–0.5
6.0
5.5
V
DC voltage on an I/O
V
– 0.5
V
I/O
I/O
SS
SS
I
I
DC output current on an I/O
Supply current
—
—
±25
100
400
+150
+85
mA
mA
mW
°C
P
tot
Total power dissipation
Storage temperature range
Operating ambient temperature
—
T
stg
–65
–40
T
amb
°C
HANDLING
Inputs and outputs are protected against electrostatic discharge in normal handling. However, to be totally safe, it is desirable to take
precautions appropriate to handling MOS devices. Advice can be found in Data Handbook IC24 under ”Handling MOS devices”.
DC CHARACTERISTICS
V
= 2.3 V to 5.5 V; V = 0 V; T
= –40 °C to +85 °C; unless otherwise specified. TYP at 3.3 V and 25 °C.
DD
SS
amb
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
Supplies
V
Supply voltage
Supply current
2.3
—
—
5.5
V
DD
Operating mode; V = 5.5 V;
DD
I
350
500
µA
DD
V = V or V ; f = 100 kHz
I
DD
SS SCL
Standby mode; V = 5.5 V;
DD
I
stb
Standby current
—
1.9
3.0
µA
V = V or V ; f = 0 kHz
I
DD
SS SCL
Standby mode; V = 5.5 V; Every
DD
∆I
Additional standby current
—
—
—
800
2.2
µA
DD
LED I/O at V = 4.3 V; f
= 0 kHz
IN
SCL
V
POR
Power-on reset voltage (Note 1)
No load; V = V or V
1.7
V
I
DD
SS
Input SCL; input/output SDA
V
LOW-level input voltage
HIGH-level input voltage
LOW-level output current
Leakage current
–0.5
—
—
0.3 V
V
V
IL
IH
DD
V
0.7 V
3
5.5
—
+1
5
DD
I
OL
V
= 0.4 V
6.5
—
mA
µA
pF
OL
I
L
V = V = V
I
–1
DD
SS
C
Input capacitance
V = V
I
—
3.7
I
SS
I/Os
V
LOW-level input voltage
HIGH-level input voltage
–0.5
2.0
6
—
—
9
0.8
5.5
—
—
—
—
—
—
1
V
IL
V
IH
V
V
OL
V
OL
V
OL
V
OL
V
OL
V
OL
V
DD
= 0.4 V; V = 2.3 V; Note 2
mA
mA
mA
mA
mA
mA
µA
pF
DD
= 0.4 V; V = 3.0 V; Note 2
8
11
14
14
18
24
—
2.1
DD
= 0.4 V; V = 5.0 V; Note 2
10
11
14
17
–1
—
DD
I
OL
LOW-level output current
= 0.7 V; V = 2.3 V; Note 2
DD
= 0.7 V; V = 3.0 V; Note 2
DD
= 0.7 V; V = 5.0 V; Note 2
DD
I
L
Input leakage current
= 3.6 V; V = 0 or V
I DD
C
Input/output capacitance
5
IO
Select Inputs A0, A1, A2 / RESET
V
LOW-level input voltage
–0.5
2.0
2.0
–1
—
—
0.8
5.5
V
V
IL
IH
IH
LI
V
V
HIGH-level input voltage; A0 / RESET
HIGH-level input voltage; A1 / A2
Input leakage current
—
V
+ 0.5
V
DD
I
—
1
5
µA
pF
C
Input capacitance
V = V
I SS
—
2.3
I
NOTES:
1. V must be lowered to 0.2 V in order to reset part.
DD
2. Each I/O must be externally limited to a maximum of 25 mA and the device must be limited to a maximum current of 100 mA.
12
2004 Oct 01
Philips Semiconductors
Product data sheet
8-bit I2C LED driver with programmable blink rates
PCA9551
AC SPECIFICATIONS
STANDARD MODE
FAST MODE
I C-BUS
2
2
I C-BUS
SYMBOL
PARAMETER
UNITS
MIN
0
MAX
100
—
MIN
MAX
f
Operating frequency
0
400
—
kHz
µs
µs
µs
µs
ns
ns
ns
ns
ns
µs
µs
ns
ns
ns
SCL
t
Bus free time between STOP and START conditions
Hold time after (repeated) START condition
Repeated START condition set-up time
Set-up time for STOP condition
4.7
4.0
4.7
4.0
0
1.3
BUF
t
—
0.6
—
HD;STA
t
—
0.6
—
SU;STA
SU;STO
t
—
0.6
—
t
Data in hold time
—
0
—
HD;DAT
VD;ACK
2
t
Valid time for ACK condition
—
600
600
1500
—
—
600
600
600
—
3
t
(L)
Data out valid time
—
—
—
VD;DAT
3
t
(H)
Data out valid time
—
VD;DAT
t
Data set-up time
250
4.7
4.0
—
100
SU;DAT
t
Clock LOW period
Clock HIGH period
Clock/Data fall time
Clock/Data rise time
—
1.3
—
LOW
t
—
0.6
—
HIGH
1
1
t
F
300
1000
50
20 + 0.1 C
20 + 0.1 C
—
300
300
50
b
t
R
—
b
t
Pulse width of spikes that must be suppressed by the
input filters
—
SP
Port Timing
t
t
Output data valid
—
100
1
200
—
—
100
1
200
—
ns
ns
µs
PV
PS
PH
Input data set-up time
Input data hold time
t
—
—
Reset
t
Reset pulse width
Reset recovery time
Time to reset
6
0
—
—
—
6
0
—
—
—
ns
ns
ns
W
t
REC
4,5
RESET
t
400
400
NOTES:
1. C = total capacitance of one bus line in pF.
b
2. t
= time for Acknowledgement signal from SCL LOW to SDA (out) LOW.
VD;ACK
3. t
= minimum time for SDA data out to be valid following SCL LOW.
VD;DAT
4. Resetting the device while actively communicating on the bus may cause glitches or errant STOP conditions.
5. Upon reset, the full delay will be the sum of t and the RC time constant of the SDA bus.
RESET
13
2004 Oct 01
Philips Semiconductors
Product data sheet
8-bit I2C LED driver with programmable blink rates
PCA9551
+20%
+10%
MAX
0%
PERCENT
VARIATION
AVG
–10%
–20%
–30%
–40%
MIN
–40
0
+25
+70
+85
TEMPERATURE
(°C)
SW02311
Figure 16. Typical frequency variation over process at V = 2.3 V to 3.0 V
DD
+20%
+10%
MAX
0%
PERCENT
VARIATION
AVG
MIN
–10%
–20%
–30%
–40%
–40
0
+25
+70
+85
TEMPERATURE
(°C)
SW02312
Figure 17. Typical frequency variation over process at V = 3.0 V to 5.5 V
DD
14
2004 Oct 01
Philips Semiconductors
Product data sheet
8-bit I2C LED driver with programmable blink rates
PCA9551
START
ACK OR READ CYCLE
SCL
SDA
30%
t
RESET
RESET
50%
50%
50%
t
REC
t
W
t
RESET
50%
LEDx
LED OFF
SW02310
Figure 18. Definition of RESET timing
SDA
SCL
t
R
t
F
t
t
SP
HD;STA
t
t
LOW
BUF
t
t
t
SU;STO
HD;STA
SU;STA
t
t
t
SU;DAT
HD;DAT
HIGH
P
S
Sr
P
SU00645
Figure 19. Definition of timing
BIT 7
MSB
(A7)
START
CONDITION
(S)
STOP
CONDITION
(P)
BIT 6
(A6)
BIT 7
(D1)
BIT 8
(D0)
ACKNOWLEDGE
(A)
PROTOCOL
t
t
t
HIGH
SU;STA
LOW
1 / f
SCL
SCL
SDA
t
t
t
f
BUF
r
t
t
t
t
t
HD;DAT
HD;STA
SU;DAT
VD;DAT
VD;ACK
t
SU;STO
SW02333
2
Figure 20. I C-bus timing diagram; rise and fall times refer to V and V
IL
IH
15
2004 Oct 01
Philips Semiconductors
Product data sheet
8-bit I2C LED driver with programmable blink rates
PCA9551
V
DD
V
DD
Open
R
= 500 Ω
L
V
V
O
I
PULSE
GENERATOR
D.U.T.
R
T
C
L
50 pF
DEFINITIONS
R = Load resistor FOR LEDN. R FOR SDA AND SCL > 1 kΩ
L
L
(3 mA or less current).
C = Load capacitance includes jig and probe capacitance
L
R = Termination resistance should be equal to the output
T
impedance Z of the pulse generators.
O
SW02334
Figure 21. Test circuitry for switching times
16
2004 Oct 01
Philips Semiconductors
Product data sheet
8-bit I2C LED driver with programmable blink rates
PCA9551
SO16: plastic small outline package; 16 leads; body width 3.9 mm
SOT109-1
17
2004 Oct 01
Philips Semiconductors
Product data sheet
8-bit I2C LED driver with programmable blink rates
PCA9551
TSSOP16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm
SOT403-1
18
2004 Oct 01
Philips Semiconductors
Product data sheet
8-bit I2C LED driver with programmable blink rates
PCA9551
HVQFN16: plastic thermal enhanced very thin quad flat package; no leads; 16 terminals;
body 4 x 4 x 0.85 mm
SOT629-1
19
2004 Oct 01
Philips Semiconductors
Product data sheet
8-bit I2C LED driver with programmable blink rates
PCA9551
REVISION HISTORY
Rev
Date
Description
_5
20041001
Product data sheet (9397 750 13726). Supersedes data of 2003 May 05 (9397 750 11462).
Modifications:
• “Features” section on page 2:
– second bullet: change from “... between 0.15625 and 40 Hz (6.4 and 0.025 seconds)” to “... between
0.148 Hz and 38 Hz (6.74 and 0.026 seconds)”
• “Register description” section on page 5:
– section “PCS0—Frequency Prescaler 0”: remove “... and PCA953x LED Dimmers” from Note 1 (2 places).
– section “PCS1—Frequency Prescaler 1”: remove “... and PCA953x LED Dimmers” from Note 1 (2 places).
• Add note to section “Input—Input Register” on page 5
• Add section “Pins used as General Purpose I/Os” on page 6.
• Section “Power-on Reset” on page 6 re-written.
• Section “External Reset” on page 6: second paragraph changed from “This input requires a pull-up resistor to
V
DD
.” to “This input requires a pull-up resistor to V if no active connection is used.”.
DD
• Figure 13 on page 10: add resistor values
• DC Characteristics table on page 12: add (new) Note 1 and its reference at V
.
POR
• Add Figures 20 and 21.
_4
_3
_2
20030505
20030224
20020927
Product data (9397 750 11462); ECN 853-2343 29858 dated 24 April 2003.
Supersedes data of 24 February 2003 (9397 750 11155).
Product data (9397 750 11155); ECN 853-2343 29331 of 20 December 2002;
supersedes data of 2002 Sep 09 (9397 750 10328).
Product data (9397 750 10328); ECN 853-2343 28878 of 09 September 2002.
20
2004 Oct 01
Philips Semiconductors
Product data sheet
8-bit I2C LED driver with programmable blink rates
PCA9551
2
2
Purchase of Philips I C components conveys a license under the Philips’ I C patent
2
to use the components in the I C system provided the system conforms to the
I C specifications defined by Philips. This specification can be ordered using the
2
code 9398 393 40011.
Data sheet status
Product
status
Definitions
[1]
Level
Data sheet status
[2] [3]
I
Objective data sheet
Development
This data sheet contains data from the objective specification for product development.
Philips Semiconductors reserves the right to change the specification in any manner without notice.
II
Preliminary data sheet
Product data sheet
Qualification
Production
This data sheet contains data from the preliminary specification. Supplementary data will be published
at a later date. Philips Semiconductors reserves the right to change the specification without notice, in
order to improve the design and supply the best possible product.
III
This data sheet contains data from the product specification. Philips Semiconductors reserves the
right to make changes at any time in order to improve the design, manufacturing and supply. Relevant
changes will be communicated via a Customer Product/Process Change Notification (CPCN).
[1] Please consult the most recently issued data sheet before initiating or completing a design.
[2] The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at URL
http://www.semiconductors.philips.com.
[3] For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status.
Definitions
Short-form specification — The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see
the relevant data sheet or data handbook.
Limitingvaluesdefinition— Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 60134). Stress above one or more of the limiting
values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given
in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability.
Application information — Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no
representation or warranty that such applications will be suitable for the specified use without further testing or modification.
Disclaimers
Life support — These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be
expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree
to fully indemnify Philips Semiconductors for any damages resulting from such application.
Right to make changes — Philips Semiconductors reserves the right to make changes in the products—including circuits, standard cells, and/or software—described
or contained herein in order to improve design and/or performance. When the product is in full production (status ‘Production’), relevant changes will be communicated
viaaCustomerProduct/ProcessChangeNotification(CPCN).PhilipsSemiconductorsassumesnoresponsibilityorliabilityfortheuseofanyoftheseproducts,conveys
nolicenseortitleunderanypatent, copyright, ormaskworkrighttotheseproducts, andmakesnorepresentationsorwarrantiesthattheseproductsarefreefrompatent,
copyright, or mask work right infringement, unless otherwise specified.
Koninklijke Philips Electronics N.V. 2004
Contact information
All rights reserved. Printed in U.S.A.
For additional information please visit
http://www.semiconductors.philips.com.
Fax: +31 40 27 24825
Date of release: 10-04
9397 750 13726
For sales offices addresses send e-mail to:
sales.addresses@www.semiconductors.philips.com.
Document number:
Philips
Semiconductors
相关型号:
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