PCA9531 PHILIPS
Document overview
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Technical content
Philips Semiconductors Product data PCA95318-bit I2C LED dimmer
22003 Nov 10
FEATURES
- Eight LED drivers (on, off, flashing at a programmable rate)
- Two selectable, fully programmable blink rates (frequency and duty cycle) between 0.625 and 160 Hz (1.6 and 6.25 milliseconds)
- 256 brightness steps
- Input/outputs not used as LED drivers can be used as regular GPIOs
- Internal oscillator requires no external components
- I2C interface logic compatible with SMBus
- Internal power-on reset
- Noise filter on SCL/SDA inputs
- Active low reset input
- Eight 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 JEDEC Standard JESD78 which exceeds 100 mA
- Package offer: SO16, TSSOP16, HVQFN16
DESCRIPTION
The PCA9531 is an 8-bit I2C & SMBus I/O expander optimized for dimming LEDs in 256 discrete steps for Red/Green/Blue (RGB) color mixing and back light applications. The PCA9531 contains an internal oscillator with two user programmable blink rates and duty cycles coupled to the output PWM. The LED brightness is controlled by setting the blink rate high enough (> 100 Hz) that the blinking can not be seen and then using the duty cycle to vary the amount of time the LED is on and thus the average current through the LED. The initial setup sequence programs the two blink rates/duty cycles for each individual PWM. From then on, only one command from the bus master is required to turn individual LEDs ON, OFF, BLINK RATE 1 or BLINK RATE 2. Based on the programmed frequency and duty cycle, BLINK RATE 1 and BLINK RATE 2 will cause the LEDs to appear at a different brightness or blink at periods up to 1.6 second. The open drain outputs directly drive the LEDs with maximum output sink current of 25 mA per bit and 100 mA per package. To blink LEDs at periods greater than 1.6 second the bus master (MCU, MPU, DSP, chipset, etc.) must send repeated commands to turn the LED on and off as is currently done when using normal I/O Expanders like the Philips PCF8574 or PCA9554. Any bits not used for controlling the LEDs can be used for General Purpose Parallel Input/Output (GPIO) expansion which provides a simple solution when additional I/O is needed for ACPI power switches, sensors, push-buttons, alarm monitoring, fans, etc. The active low hardware reset pin (RESET) and Power On Reset (POR) initializes the registers to their default state causing the bits to be set high (LED off). Three hardware address pins on the PCA9531 allow eight devices to operate on the same bus.
ORDERING INFORMATION
PACKAGES TEMPERATURE RANGE ORDER CODE TOPSIDE MARK DRAWING NUMBER 16-pin plastic SO -40 to +85 °C PCA9531D PCA9531D SOT109-1 16-pin plastic TSSOP -40 to +85 °C PCA9531PW PCA9531 SOT403-1 16-pin plastic HVQFN -40 to +85 °C PCA9531BS 9531 SOT629-1 Standard packing quantities and other packaging data is available at www.philipslogic.com/packaging. I2C is a trademark of Philips Semiconductors Corporation.
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Figure 1. Pin configuration — SO, TSSOP Figure 2. Pin configuration — HVQFN
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Figure 3. Block diagram
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Figure 4. Slave address Figure 5. Control register Control Register are automatically incremented after a read or write. the input register (B2 B1 B0 /C0048 0 0 0). Only the 3 least significant bits are affected by the AI flag. Unused bits must be programmed with zeroes. this register will be acknowledged but will have no effect. PSC0 is used to program the period of the PWM output. PSC1 is used to program the period of PWM output. The LSx LED select registers determine the source of the LED data.
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initialized to their default states, all the outputs in the off state. This input requires a pull-up resistor to VDD. 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. control signals (see Figure 6). Figure 6. Bit transfer Figure 7. Definition of start and stop conditions Figure 8. System configuration
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extra acknowledge related clock pulse. pulse, set-up and hold times must be taken into account. the slave. In this event, the transmitter must leave the data line HIGH to enable the master to generate a stop condition. Figure 9. Acknowledgement on the I2C-bus
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Figure 10. WRITE to register Figure 11. READ from register
- This figure assumes the command byte has previously been programmed with 00h.
Figure 12. READ input port register
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LED6 and LED7 are used as regular GPIOs. Figure 13. Typical application specified as ∆IDD in the DC characteristics table. Figure 14. High value resistor in parallel with the LED Figure 15. Device supplied by a lower voltage
Philips Semiconductors Product data PCA95318-bit I2C LED dimmer
2003 Nov 10 10
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 be dimmed at 25% of their maximum brightness (duty cycle = 25%). Table 1. I2C-bus Start S PCA9531 address with A0-A2 = low C0h PSC0 subaddress + auto-increment 11h Set prescaler PSC0 to achieve a period of 1 second: Blink period /C00431 /C0043PSC0 /C00411 152 PSC0 = 151 97h Set PWM0 duty cycle to 50%: PWM0 256 /C00430.5 PWM0 = 128 80h Set prescaler PCS1 to dim at max frequency: Blink period /C0043max PSC1 = 0 00h Set PWM1 output duty cycle to 25%: PWM1 256 /C00430.25 PWM1 = 64 40h Set LED0 to LED3 on 55h Set LED4 and 5 to PWM0, and LED6 or 7 to PWM1 FAh Stop P
Philips Semiconductors Product data PCA95318-bit I2C LED dimmer
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In accordance with the Absolute Maximum Rating System (IEC 134) SYMBOL PARAMETER CONDITIONS MIN MAX UNIT VDD Supply voltage -0.5 6.0 V VI/O DC voltage on an I/O VSS - 0.5 5.5 V II/O DC output current on an I/O — +25 mA ISS Supply current — 200 mA Ptot Total power dissipation — 400 mW Tstg Storage temperature range -65 +150 °C Tamb Operating ambient temperature -40 +85 °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 SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNIT Supplies VDD Supply voltage 2.3 — 5.5 V IDD Supply current Operating mode; VDD = 5.5 V; VI = VDD or VSS; fSCL = 100 kHz — 350 500 µA Istb Standby current Standby mode; VDD = 5.5 V; VI = VDD or VSS; fSCL = 0 kHz — 1.9 3.0 µA ∆IDD Additional standby current Standby mode; VDD = 5.5 V; Every LED I/O at VIN = 4.3 V; fSCL = 0 kHz — — 800 µA VPOR Power-on reset voltage No load; VI = VDD or VSS — 1.7 2.2 V Input SCL; input/output SDA VIL LOW level input voltage -0.5 — 0.3 VDD V VIH HIGH level input voltage 0.7 VDD — 5.5 V IOL LOW level output current VOL = 0.4V 3 6.5 — mA IL Leakage current VI = VDD = VSS -1 — +1 µA CI Input capacitance VI = VSS — 3.7 5 pF I/Os VIL LOW level input voltage -0.5 — 0.8 V VIH HIGH level input voltage 2.0 — 5.5 V VOL = 0.4 V; VDD = 2.3 V; Note 1 9 — — mA VOL = 0.4 V; VDD = 3.0 V; Note 1 12 — — mA VOL = 0.4 V; VDD = 5.0 V; Note 1 15 — — mA IOL LOW level output current VOL = 0.7 V; VDD = 2.3 V; Note 1 15 — — mA VOL = 0.7 V; VDD = 3.0 V; Note 1 20 — — mA VOL = 0.7 V; VDD = 5.0 V; Note 1 25 — — mA IL Input leakage current VDD = 3.6 V; VI = 0 or VDD -1 — 1 µA CIO Input/output capacitance — 2.5 5 pF Select Inputs A0, A1, A2 / RESET VIL LOW level input voltage -0.5 — 0.8 V VIH HIGH level input voltage; A0 / RESET 2.0 — 5.5 V VIH HIGH level input voltage; A1 / A2 2.0 — VDD + 0.5 V ILI Input leakage current -1 — 1 µA CI Input capacitance VI = VSS — 2.3 5 pF NOTE: 1. 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.
Philips Semiconductors Product data PCA95318-bit I2C LED dimmer
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I2C BUS UNITSSYMBOL PARAMETER MIN MAX MIN MAX UNITS fSCL Operating frequency 0 100 0 400 kHz tBUF Bus free time between STOP and START conditions 4.7 — 1.3 — µs tHD;STA Hold time after (repeated) START condition 4.0 — 0.6 — µs tSU;STA Repeated START condition setup time 4.7 — 0.6 — µs tSU;STO Setup time for STOP condition 4.0 — 0.6 — µs tHD;DAT Data in hold time 0 — 0 — ns tVD;ACK Valid time for ACK condition2 — 600 — 600 ns tVD;DAT (L) Data out valid time3 — 600 — 600 ns tVD;DAT (H) Data out valid time3 — 1500 — 600 ns tSU;DAT Data setup time 250 — 100 — ns tLOW Clock LOW period 4.7 — 1.3 — µs tHIGH Clock HIGH period 4.0 — 0.6 — µs tF Clock/Data fall time — 300 20 + 0.1 Cb1 300 ns tR Clock/Data rise time — 1000 20 + 0.1 Cb1 300 ns tSP Pulse width of spikes that must be suppressed by the input filters — 50 — 50 ns Port Timing tPV Output data valid — 200 — 200 ns tPS Input data setup time 100 — 100 — ns tPH Input data hold time 1 — 1 — µs Reset tW Reset pulse width 6 — 6 — ns tREC Reset recovery time 0 — 0 — ns tRESET4,5 Time to reset 400 — 400 — ns NOTES: 1. C b = total capacitance of one bus line in pF. 2. t VD;ACK = time for Acknowledgement signal from SCL low to SDA (out) low. 3. t VD;DAT = minimum time for SDA data out to be valid following SCL low. 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 RESET and the RC time constant of the SDA bus.
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Figure 16. Typical frequency variation over process at VDD = 2.3 V to 3.0 V Figure 17. Typical frequency variation over process at VDD = 3.0 V to 5.5 V
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Figure 18. Definition of RESET timing Figure 19. Definition of timing
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Figure 20. I2C-bus timing diagram; rise and fall times refer to VIL and VIH impedance ZO of the pulse generators. Figure 21. Test circuitry for switching times
Philips Semiconductors Product data PCA95318-bit I2C LED dimmer
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SO16: plastic small outline package; 16 leads; body width 3.9 mm SOT109-1
Philips Semiconductors Product data PCA95318-bit I2C LED dimmer
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TSSOP16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm SOT403-1
Philips Semiconductors Product data PCA95318-bit I2C LED dimmer
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HVQFN16: plastic thermal enhanced very thin quad flat package; no leads; 16 terminals; body 4 x 4 x 0.85 mm SOT629-1
Philips Semiconductors Product data PCA95318-bit I2C LED dimmer
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REVISION HISTORY
_1 20031110 Product data (9397 750 12292); ECN 853-2407 30411 dated 06 September 2003. Initial version
Philips Semiconductors Product data PCA95318-bit I2C LED dimmer
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Purchase of Philips I2C components conveys a license under the Philips’ I2C patent to use the components in the I 2C system provided the system conforms to the I2C specifications defined by Philips. This specification can be ordered using the code 9398 393 40011. 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. Limiting values definition — 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 ma ke 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 ca n 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 via a Customer Product/Process Change Notification (CPCN). Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified. Contact information For additional information please visit http://www.semiconductors.philips.com. Fax: +31 40 27 24825 For sales offices addresses send e-mail to: Koninklijke Philips Electronics N.V. 2002 All rights reserved. Printed in U.S.A. Date of release: 11-03 Document order number: 9397 750 12292 Philips Semiconductors Data sheet status[1] Objective data Preliminary data Product data Product status[2] [3] Development Qualification Production Definitions 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. 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. 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). Data sheet status [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 l atest 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. Level I II III