数据手册page6 – page8(PCA96_datasheet).pdf

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1. General description

2. Features

3. Applications

4. Ordering information

5. Block diagram

6. Pinning information

6.1 Pinning

6.2 Pin description

7. Functional description

7.1 Device addresses

7.1.1 Regular I2C-bus slave address

7.1.2 LED All Call I2C-bus address

7.1.3 LED Sub Call I2C-bus addresses

7.1.4 Software Reset I2C-bus address

7.2 Control register

7.3 Register definitions

7.3.1 Mode register 1, MODE1

7.3.1.1 Restart mode

7.3.2 Mode register 2, MODE2

7.3.3 LED output and PWM control

7.3.4 ALL_LED_ON and ALL_LED_OFF control

7.3.5 PWM frequency PRE_SCALE

7.3.6 SUBADR1 to SUBADR3, I2C-bus subaddress 1 to 3

7.3.7 ALLCALLADR, LED All Call I2C-bus address

7.4 Active LOW output enable input

7.5 Power-on reset

7.6 Software reset

7.7 Using the PCA9685 with and without external drivers

8. Characteristics of the I2C-bus

8.1 Bit transfer

8.1.1 START and STOP conditions

8.2 System configuration

8.3 Acknowledge

9. Bus transactions

10. Application design-in information

11. Limiting values

12. Static characteristics

13. Dynamic characteristics

14. Test information

15. Package outline

16. Handling information

17. Soldering of SMD packages

17.1 Introduction to soldering

17.2 Wave and reflow soldering

17.3 Wave soldering

17.4 Reflow soldering

18. Abbreviations

19. Revision history

20. Legal information

20.1 Data sheet status

20.2 Definitions

20.3 Disclaimers

20.4 Trademarks

21. Contact information

22. Contents

PCA9685 16-channel, 12-bit PWM Fm+ I2C-bus LED controller Rev. 02 — 16 July 2009 Product data sheet 1. General description The PCA9685 is an I2C-bus controlled 16-channel LED controller optimized for LCD Red/Green/Blue/Amber (RGBA) color backlighting applications. Each LED output has its own 12-bit resolution (4096 steps) ﬁxed frequency individual PWM controller that operates at a programmable frequency from a typical of 40 Hz to 1000 Hz with a duty cycle that is adjustable from 0 % to 100 % to allow the LED to be set to a speciﬁc brightness value. All outputs are set to the same PWM frequency. Each LED output can be off or on (no PWM control), or set at its individual PWM controller value. The LED output driver is programmed to be either open-drain with a 25 mA current sink capability at 5 V or totem pole with a 25 mA sink, 10 mA source capability at 5 V. The PCA9685 operates with a supply voltage range of 2.3 V to 5.5 V and the inputs and outputs are 5.5 V tolerant. LEDs can be directly connected to the LED output (up to 25 mA, 5.5 V) or controlled with external drivers and a minimum amount of discrete components for larger current or higher voltage LEDs. The PCA9685 is in the new Fast-mode Plus (Fm+) family. Fm+ devices offer higher frequency (up to 1 MHz) and more densely populated bus operation (up to 4000 pF). Although the PCA9635 and PCA9685 have many similar features, the PCA9685 has some unique features that make it more suitable for applications such as LCD backlighting and Ambilight: • The PCA9685 allows staggered LED output on and off times to minimize current surges. The on and off time delay is independently programmable for each of the 16 channels. This feature is not available in PCA9635. • The PCA9685 has 4096 steps (12-bit PWM) of individual LED brightness control. The PCA9635 has only 256 steps (8-bit PWM). • When multiple LED controllers are incorporated in a system, the PWM pulse widths between multiple devices may differ if PCA9635s are used. The PCA9685 has a programmable prescaler to adjust the PWM pulse widths of multiple devices. • The PCA9685 has an external clock input pin that will accept user-supplied clock (50 MHz max.) in place of the internal 25 MHz oscillator. This feature allows synchronization of multiple devices. The PCA9635 does not have external clock input feature. • Like the PCA9635, PCA9685 also has a built-in oscillator for the PWM control. However, the frequency used for PWM control in the PCA9685 is adjustable from about 40 Hz to 1000 Hz as compared to the typical 97.6 kHz frequency of the PCA9635. This allows the use of PCA9685 with external power supply controllers. All bits are set at the same frequency. • The Power-On Reset (POR) default state of LEDn output pins is LOW in the case of PCA9685. It is HIGH for PCA9635.

NXP Semiconductors PCA9685 16-channel, 12-bit PWM Fm+ I2C-bus LED controller 2. Features The active LOW Output Enable input pin (OE) allows asynchronous control of the LED outputs and can be used to set all the outputs to a deﬁned I2C-bus programmable logic state. The OE can also be used to externally ‘pulse width modulate’ the outputs, which is useful when multiple devices need to be dimmed or blinked together using software control. Software programmable LED All Call and three Sub Call I2C-bus addresses allow all or deﬁned groups of PCA9685 devices to respond to a common I2C-bus address, allowing for example, all red LEDs to be turned on or off at the same time or marquee chasing effect, thus minimizing I2C-bus commands. Six hardware address pins allow up to 62 devices on the same bus. The Software Reset (SWRST) General Call allows the master to perform a reset of the PCA9685 through the I2C-bus, identical to the Power-On Reset (POR) that initializes the registers to their default state causing the outputs to be set LOW. This allows an easy and quick way to reconﬁgure all device registers to the same condition via software. n 16 LED drivers. Each output programmable at: u Off u On u Programmable LED brightness u Programmable LED turn-on time to help reduce EMI n 1 MHz Fast-mode Plus compatible I2C-bus interface with 30 mA high drive capability on SDA output for driving high capacitive buses n 4096-step (12-bit) linear programmable brightness per LED output varying from fully off (default) to maximum brightness n LED output frequency (all LEDs) typically varies from 40 Hz to 1000 Hz (Default of 1Eh in PRE_SCALE register results in a 200 Hz refresh rate with oscillator clock of 25 MHz.) n Sixteen totem pole outputs (sink 25 mA and source 10 mA at 5 V) with software programmable open-drain LED outputs selection (default at totem pole). No input function. n Output state change programmable on the Acknowledge or the STOP Command to update outputs byte-by-byte or all at the same time (default to ‘Change on STOP’). n Active LOW Output Enable (OE) input pin. LEDn outputs programmable to logic 1, logic 0 (default at power-up) or ‘high-impedance’ when OE is HIGH. n 6 hardware address pins allow 62 PCA9685 devices to be connected to the same I2C-bus n Toggling OE allows for hardware LED blinking n 4 software programmable I2C-bus addresses (one LED All Call address and three LED Sub Call addresses) allow groups of devices to be addressed at the same time in any combination (for example, one register used for ‘All Call’ so that all the PCA9685s on the I2C-bus can be addressed at the same time and the second register used for three different addresses so that 1⁄3 of all devices on the bus can be addressed at the same time in a group). Software enable and disable for these I2C-bus address. n Software Reset feature (SWRST General Call) allows the device to be reset through the I2C-bus PCA9685_2 Product data sheet Rev. 02 — 16 July 2009 © NXP B.V. 2009. All rights reserved. 2 of 50

NXP Semiconductors PCA9685 16-channel, 12-bit PWM Fm+ I2C-bus LED controller n 25 MHz typical internal oscillator requires no external components n External 50 MHz (max.) clock input n Internal power-on reset n Noise ﬁlter on SDA/SCL inputs n Edge rate control on outputs n No output glitches on power-up n Supports hot insertion n Low standby current n Operating power supply voltage range of 2.3 V to 5.5 V n 5.5 V tolerant inputs n - 40 C to +85 C operation n ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101 n Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA n Packages offered: TSSOP28, HVQFN28 3. Applications n RGB or RGBA LED drivers n LED status information n LED displays n LCD backlights n Keypad backlights for cellular phones or handheld devices 4. Ordering information Table 1. Type number Ordering information Topside mark PCA9685PW PCA9685PW Package Name TSSOP28 PCA9685PW/Q900[1] PCA9685PW TSSOP28 PCA9685BS PCA9685BS HVQFN28 Description plastic thin shrink small outline package; 28 leads; body width 4.4 mm plastic thin shrink small outline package; 28 leads; body width 4.4 mm plastic thermal enhanced very thin quad ﬂat package; no leads; 28 terminals; body 6 · 6 · 0.85 mm Version SOT361-1 SOT361-1 SOT788-1 [1] PCA9685PW/Q900 is AEC-Q100 compliant. Contact i2c.support@nxp.com for PPAP. PCA9685_2 Product data sheet Rev. 02 — 16 July 2009 © NXP B.V. 2009. All rights reserved. 3 of 50

NXP Semiconductors 5. Block diagram PCA9685 16-channel, 12-bit PWM Fm+ I2C-bus LED controller A0 A1 A2 A3 A4 A5 I2C-BUS CONTROL PCA9685 INPUT FILTER POWER-ON RESET VDD LED STATE SELECT REGISTER PWM REGISTER X BRIGHTNESS CONTROL PRESCALE 25 MHz OSCILLATOR CLOCK SWITCH '0' – permanently OFF '1' – permanently ON LEDn MUX/ CONTROL 002aac824 SCL SDA VDD VSS EXTCLK OE Remark: Only one LED output shown for clarity. Fig 1. Block diagram of PCA9685 PCA9685_2 Product data sheet Rev. 02 — 16 July 2009 © NXP B.V. 2009. All rights reserved. 4 of 50

NXP Semiconductors 6. Pinning information 6.1 Pinning PCA9685 16-channel, 12-bit PWM Fm+ I2C-bus LED controller A0 A1 A2 A3 A4 LED0 LED1 LED2 LED3 LED4 LED5 LED6 LED7 VSS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VDD SDA SCL EXTCLK A5 OE LED15 LED14 LED13 LED12 LED11 LED10 LED9 LED8 PCA9685PW PCA9685PW/Q900 002aac825 terminal 1 index area 2 A 1 A 0 A D D V A D S L C S K L C T X E 8 2 7 2 6 2 5 2 4 2 3 2 2 2 A3 A4 LED0 LED1 LED2 LED3 LED4 1 2 3 4 5 6 7 PCA9685BS 0 8 9 1 1 1 2 1 3 1 4 1 5 D E L 6 D E L 7 D E L S S V 8 D E L 9 D E L 0 1 D E L Transparent top view 21 20 19 18 17 16 15 A5 OE LED15 LED14 LED13 LED12 LED11 002aad236 Fig 2. Pin conﬁguration for TSSOP28 Fig 3. Pin conﬁguration for HVQFN28 6.2 Pin description Table 2. Symbol A0 A1 A2 A3 A4 LED0 LED1 LED2 LED3 LED4 LED5 LED6 LED7 VSS LED8 LED9 LED10 LED11 Pin description Pin TSSOP28 HVQFN28 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 26 27 28 1 2 3 4 5 6 7 8 9 10 11[1] 12 13 14 15 Type Description I I I I I O O O O O O O O power supply O O O O address input 0 address input 1 address input 2 address input 3 address input 4 LED driver 0 LED driver 1 LED driver 2 LED driver 3 LED driver 4 LED driver 5 LED driver 6 LED driver 7 supply ground LED driver 8 LED driver 9 LED driver 10 LED driver 11 PCA9685_2 Product data sheet Rev. 02 — 16 July 2009 © NXP B.V. 2009. All rights reserved. 5 of 50

NXP Semiconductors PCA9685 16-channel, 12-bit PWM Fm+ I2C-bus LED controller Table 2. Symbol LED12 LED13 LED14 LED15 OE A5 EXTCLK SCL SDA VDD Pin description …continued Pin TSSOP28 HVQFN28 19 20 21 22 23 24 25 26 27 28 16 17 18 19 20 21 22 23 24 25 Type O O O O I I I I I/O power supply Description LED driver 12 LED driver 13 LED driver 14 LED driver 15 active LOW output enable address input 5 external clock input[2] serial clock line serial data line supply voltage [1] HVQFN28 package die supply ground is connected to both VSS pin and exposed center pad. VSS pin must be connected to supply ground for proper device operation. For enhanced thermal, electrical, and board level performance, the exposed pad needs to be soldered to the board using a corresponding thermal pad on the board and for proper heat conduction through the board, thermal vias need to be incorporated in the PCB in the thermal pad region. [2] This pin must be grounded when this feature is not used. 7. Functional description Refer to Figure 1 “Block diagram of PCA9685”. 7.1 Device addresses Following a START condition, the bus master must output the address of the slave it is accessing. There are a maximum of 64 possible programmable addresses using the 6 hardware address pins. Two of these addresses, Software Reset and LED All Call, cannot be used because their default power-up state is ON, leaving a maximum of 62 addresses. Using other reserved addresses, as well as any other subcall address, will reduce the total number of possible addresses even further. 7.1.1 Regular I2C-bus slave address The I2C-bus slave address of the PCA9685 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. Remark: Using reserved I2C-bus addresses will interfere with other devices, but only if the devices are on the bus and/or the bus will be open to other I2C-bus systems at some later date. In a closed system where the designer controls the address assignment these addresses can be used since the PCA9685 treats them like any other address. The LED All Call, Software Reset and PCA9564 or PCA9665 slave address (if on the bus) can never be used for individual device addresses. • PCA9685 LED All Call address (1110 000) and Software Reset (0000 0110) which are active on start-up PCA9685_2 Product data sheet Rev. 02 — 16 July 2009 © NXP B.V. 2009. All rights reserved. 6 of 50

NXP Semiconductors PCA9685 16-channel, 12-bit PWM Fm+ I2C-bus LED controller • PCA9564 (0000 000) or PCA9665 (1110 000) slave address which is active on start-up • ‘reserved for future use’ I2C-bus addresses (0000 011, 1111 1XX) • slave devices that use the 10-bit addressing scheme (1111 0XX) • slave devices that are designed to respond to the General Call address (0000 000) which is used as the software reset address • High-speed mode (Hs-mode) master code (0000 1XX) slave address 1 A5 A4 A3 A2 A1 A0 R/W fixed hardware selectable 002aad168 Fig 4. Slave address The last bit of the address byte deﬁnes the operation to be performed. When set to logic 1 a read is selected, while a logic 0 selects a write operation. 7.1.2 LED All Call I2C-bus address • Default power-up value (ALLCALLADR register): E0h or 1110 000X • Programmable through I2C-bus (volatile programming) • At power-up, LED All Call I2C-bus address is enabled. PCA9685 sends an ACK when E0h (R/W = 0) or E1h (R/W = 1) is sent by the master. See Section 7.3.7 “ALLCALLADR, LED All Call I2C-bus address” for more detail. Remark: The default LED All Call I2C-bus address (E0h or 1110 000X) must not be used as a regular I2C-bus slave address since this address is enabled at power-up. All the PCA9685s on the I2C-bus will acknowledge the address if sent by the I2C-bus master. 7.1.3 LED Sub Call I2C-bus addresses • 3 different I2C-bus addresses can be used • Default power-up values: – SUBADR1 register: E2h or 1110 001X – SUBADR2 register: E4h or 1110 010X – SUBADR3 register: E8h or 1110 100X • Programmable through I2C-bus (volatile programming) • At power-up, Sub Call I2C-bus addresses are disabled. PCA9685 does not send an ACK when E2h (R/W = 0) or E3h (R/W = 1), E4h (R/W = 0) or E5h (R/W = 1), or E8h (R/W = 0) or E9h (R/W = 1) is sent by the master. See Section 7.3.6 “SUBADR1 to SUBADR3, I2C-bus subaddress 1 to 3” for more detail. Remark: The default LED Sub Call I2C-bus addresses may be used as regular I2C-bus slave addresses as long as they are disabled. PCA9685_2 Product data sheet Rev. 02 — 16 July 2009 © NXP B.V. 2009. All rights reserved. 7 of 50

NXP Semiconductors PCA9685 16-channel, 12-bit PWM Fm+ I2C-bus LED controller 7.1.4 Software Reset I2C-bus address The address shown in Figure 5 is used when a reset of the PCA9685 needs to be performed by the master. The Software Reset address (SWRST Call) must be used with R/W = logic 0. If R/W = logic 1, the PCA9685 does not acknowledge the SWRST. See Section 7.6 “Software reset” for more detail. R/W 0 0 0 0 0 1 1 0 002aab416 Fig 5. Software Reset address Remark: The Software Reset I2C-bus address is a reserved address and cannot be used as a regular I2C-bus slave address or as an LED All Call or LED Sub Call address. 7.2 Control register Following the successful acknowledgement of the slave address, LED All Call address or LED Sub Call address, the bus master will send a byte to the PCA9685, which will be stored in the Control register. This register is used as a pointer to determine which register will be accessed. D7 D6 D5 D4 D3 D2 D1 D0 002aac826 reset state = 00h Remark: The Control register does not apply to the Software Reset I2C-bus address. Fig 6. Control register PCA9685_2 Product data sheet Rev. 02 — 16 July 2009 © NXP B.V. 2009. All rights reserved. 8 of 50

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