TCA6507 LOW-VOLTAGE 7-BIT I C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN 2 www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 FEATURES 1 • • • • • • • • • • • Seven LED Driver Outputs: On, Off, Blinking, Fading at Programmable Rates Open-Drain Outputs Directly Drive LEDs to 40 mA Max Can Be Configured Into Two Independent Banks of LED Drivers Widely Programmable Blink Rates, Fade-On and Fade-Off Rates and Maximum Intensity LED Intensity Set Using Pulse Width Modulation (PWM) Outputs Not Used as LED Drivers Can Be Used as Regular General-Purpose Open-Drain Outputs 16 Steps of Maximum Intensity Control from Fully-Off to Fully-On States 256 Intensity Levels During Fade-On or Fade-Off for Smooth Perceived Transition Operating Power-Supply Voltage Range of 1.65 V to 3.6 V EVM Available • • • • • • • • • • • PW PACKAGE (TOP VIEW) ZXU PACKAGE (TOP VIEW) C VCC SCL SDA EN GND NC NC 1 14 2 13 3 12 4 11 5 10 6 9 7 8 Schmitt-Trigger Action Allows Slow Input Transition and Better Switching Noise Immunity at the Inputs – Vhys = 0.18 V Typ at 1.8 V – Vhys = 0.25 V Typ at 2.5 V – Vhys = 0.33 V Typ at 3.3 V 5.5-V Tolerant Open-Drain Outputs Low Standby Current with Shutdown Capability for Additional Power Savings Internal Power-On Reset Internal Oscillator Requires No External Components Programmed Through I2C Bus Interface Logic Compatible With SMBus 400-kHz Fast I2C Bus Noise Filter on SCL/SDA Inputs No Glitch on Power Up Supports Hot Insertion ESD Protection Exceeds JESD 22 – 2000-V Human-Body Model (A114-A) – 200-V Machine Model (A115-A) – 1000-V Charged-Device Model (C101) Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II P6 P5 P4 P3 P2 P1 P0 B RUE PACKAGE (TOP VIEW) P6 A VCC 1 11 P5 SCL 2 10 P4 SDA 3 9 P3 3 EN 4 8 P2 4 GND 5 7 P1 1 2 12 6 P0 NC – No internal connection DESCRIPTION/ORDERING INFORMATION This 7-bit LED dimmer for the two-line bidirectional bus (I2C) is designed to control (or dim) LEDs via the I2C interface [serial clock (SCL), serial data (SDA)]. Without this device, the microprocessor or microcontroller must be actively involved in turning on and off the LEDs (per the required dimming rate), which uses valuable processor time and the overloads I2C bus. The TCA6507 alleviates this issue by limiting the number of operations required by the processor in blinking LEDs and, thus, helps to create a more efficient system. 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2007, Texas Instruments Incorporated TCA6507 LOW-VOLTAGE 7-BIT I2C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 DESCRIPTION/ORDERING INFORMATION (CONTINUED) ORDERING INFORMATION PACKAGE (1) (2) TA –40°C to 85°C (1) (2) ORDERABLE PART NUMBER TOP-SIDE MARKING BGA – ZXU (Pb-free) Reel of 2500 TCA6507ZXUR PH507 QFN – RUE Reel of 3000 TCA6507RUER 2M TSSOP – PW Reel of 2000 TCA6507PWR PH507 Package drawings, thermal data, and symbolization are available at www.ti.com/packaging. For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at www.ti.com. This device can be used for driving LEDs and for general-purpose parallel output expansion. The TCA6507 has three Select registers (Select0, Select1 and Select2), which can be used to configure each LED output into one of seven different operating modes. At power on, the outputs are in high impedance. When used to drive LEDs, the seven outputs can be configured into two banks of outputs (BANK0 and BANK1). Each bank of outputs can be independently controlled for dimming rate and intensity through the I2C bus. The dimming and blink rates are fully programmable. The intensity of each bank of LEDs is controlled by dynamically varying the duty cycle of the signal, which has a period of approximately 8 ms and a pulse rate of 125 times per second, driving the outputs. The TCA6507 has two independent dimming/blinking modules—PWM0 and PWM1—driven by a single internal oscillator that supports these features. PWM0 determines the characteristics of BANK0 and PWM1 determines the characteristics of BANK1. The TCA6507 has a master intensity level known as the ambient light detection (ALD) value. The associated pulse width modulation (PWM) signal for this value is PWMALD. The TCA6507 can be programmed such that PWMALD overrides PWM0 or PWM1 so selected LEDs are on steadily at the master intensity level. Further, the TCA6507 can be programmed such that the ALD value can override the maximum intensity values for PWM0 and PWM1. Thus, the ALD value can control the brightness of all LEDs whether they are on steadily or controlled by one of the dimming modules. The ALD value is stored in the lower four bits of the One-Shot / Master Intensity register. When the I2C bus is idle, and intensity control is not used, the TCA6507 can be put into shutdown mode by setting the enable (EN) pin low. This mode provides additional power savings, as it is a low-power mode where the LEDs are off. A low signal on the EN pin also resets the registers and I2C/SMBus state machine in the TCA6507 to their default state. An initial setup command must be sent from the I2C master to the TCA6507 to program the dimming rate and intensity (and intensity ramp if needed) for each bank of outputs. From then on, only one command from the bus master is required to turn each individual output ON, OFF, or to cycle at the programmed dimming rate. The default value for all time parameters is 256 ms so the default blink rate is approximately one per second. The TCA6507 is optimized for 1.65 V to 3.6 V on the SDA/SCL side, but the LEDs can be driven by any voltage up to 5.5 V. This allows the TCA6507 to interface with next-generation microprocessors and microcontrollers, where supply levels are dropping down to conserve power. This LED dimmer supports hot insertion. ZXU PACKAGE TERMINAL ASSIGNMENTS 2 C B A 1 P1 P2 GND 2 P3 EN SDA 3 P4 P0 SCL 4 P5 P6 VCC Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 TCA6507 LOW-VOLTAGE 7-BIT I C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN 2 www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 TERMINAL FUNCTIONS BALL POSITION PIN NO. NAME DESCRIPTION BGA (ZXU) QFN (RUE) TSSOP (PW) A1 5 5 GND Ground A2 3 3 SDA Serial data bus. Connect to VCC through a pullup resistor. A3 2 2 SCL Serial clock bus. Connect to VCC through a pullup resistor. A4 1 1 VCC Supply voltage of I2C registers, oscillator and control logic. Connect directly to VCC of the external I2C master. Provides voltage-level translation. B3 6 8 P0 P-port output 0. Open-drain design structure. C1 7 9 P1 P-port output 1. Open-drain design structure. B1 8 10 P2 P-port output 2. Open-drain design structure. C2 9 11 P3 P-port output 3. Open-drain design structure. C3 10 12 P4 P-port output 4. Open-drain design structure. C4 11 13 P5 P-port output 5. Open-drain design structure. B4 12 14 P6 P-port output 6. Open-drain design structure. B2 4 4 EN Enable input. If set to low, it puts the TCA6507 in shutdown mode and resets the internal registers and I2C/SMBus state machine to their default states FUNCTIONAL BLOCK DIAGRAM SCL SDA Glitch Filters 2 I C Bus Control Select2 Register Select1 Register Select0 Register Oscillator EN Shut Down VCC Power-On Reset LED Intensity Control Fade/ Intensity Control Registers PWMALD PWM0 PWM1 Logic 0 P6–P0 BRIGHT_F0 BRIGHT_F1 Logic 1 Figure 1. TCA6507 Functional Block Diagram Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 3 TCA6507 LOW-VOLTAGE 7-BIT I2C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 OUTPUT PORT SIMPLIFIED SCHEMATIC Select2 Register D Select2 Pulse Data From Shift Register Select1 Register D Select1 Pulse Q FF CK Q Q FF CK Q Select0 Register D Select0 Pulse Q FF CK Q Logic 1 A BRIGHT_F0 B BRIGHT_F1 C P6–P0 A ESD Protection Diode Logic 0 4 A PWMALD B PWM0 C PWM1 D B GND Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 TCA6507 LOW-VOLTAGE 7-BIT I C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN 2 www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 I2C Interface The bidirectional I2C bus consists of the serial clock (SCL) and serial data (SDA) lines. Both lines must be connected to a positive supply through a pullup resistor when connected to the output stages of a device. Data transfer may be initiated only when the bus is not busy. I2C communication with this device is initiated by a master sending a Start condition, a high-to-low transition on the SDA input/output while the SCL input is high (see Figure 2). After the Start condition, the device address byte is sent, most significant bit (MSB) first, including the data direction bit (R/W). After receiving the valid address byte, this device responds with an acknowledge (ACK)–a low on the SDA input/output during the high of the ACK-related clock pulse. On the I2C bus, only one data bit is transferred during each clock pulse. The data on the SDA line must remain stable during the high pulse of the clock period, as changes in the data line at this time are interpreted as control commands (Start or Stop) (see Figure 3). A Stop condition, a low-to-high transition on the SDA input/output while the SCL input is high, is sent by the master (see Figure 2). Any number of data bytes can be transferred from the transmitter to receiver between the Start and the Stop conditions. Each byte of eight bits is followed by one ACK bit. The transmitter must release the SDA line before the receiver can send an ACK bit. The device that acknowledges must pull down the SDA line during the ACK clock pulse so that the SDA line is stable low during the high pulse of the ACK-related clock period (see Figure 4). When a slave receiver is addressed, it must generate an ACK after each byte is received. Similarly, the master must generate an ACK after each byte that it receives from the slave transmitter. Setup and hold times must be met to ensure proper operation. A master receiver signals an end of data to the slave transmitter by not generating an acknowledge (NACK) after the last byte has been clocked out of the slave. This is done by the master receiver by holding the SDA line high. In this event, the transmitter must release the data line to enable the master to generate a Stop condition. SDA SCL S P Stop Condition Start Condition Figure 2. Definition of Start and Stop Conditions SDA SCL Data Line Change Figure 3. Bit Transfer Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 5 TCA6507 LOW-VOLTAGE 7-BIT I2C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 Data Output by Transmitter NACK Data Output by Receiver ACK SCL From Master 1 2 8 9 S Clock Pulse for Acknowledgment Start Condition Figure 4. Acknowledgment on the I2C Bus Table 1. Interface Definition BYTE 2 I C slave address Px I/O data bus (1) BIT 7 (MSB) 6 5 4 3 2 1 0 (LSB) 1 0 0 0 1 0 1 R/W X (1) P6 P5 P4 P3 P2 P1 P0 X = Don't care Device Address The address of the TCA6507 is shown in Figure 5. Fixed Slave Address 1 0 0 0 1 0 1 R/W Figure 5. TCA6507 Address The last bit of the slave address defines the operation (read or write) to be performed. High (1) selects a read operation, and low (0) selects a write operation. Control Register and Command Byte Following the successful acknowledgment of the address byte, the bus master sends a command byte, which is stored in the control register. The last four bits (B0, B1, B2 and B3) of this command byte determine the internal registers (Select0, Select1, Select2, Fade-On Time, Fully-On Time, Fade-Off Time, First Fully-Off Time, Second Fully-Off Time, Maximum Intensity and Initialization) that are affected. The command byte is sent only during a write transmission. 6 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 TCA6507 LOW-VOLTAGE 7-BIT I C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN 2 www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 After the command byte is received, the I2C master starts sending data bytes. The first data byte goes into the internal register defined by the command byte. Bit B4 in the command byte is used to determine the programming mode. If B4 is low, all data bytes are written to the register defined by B0, B1, B2, and B3. If B4 is high, the last four bits of the command byte are automatically incremented after the byte is written, and the next data byte is stored in the corresponding register. Registers are written in the sequence shown in Table 3. Once the Initialization register (register 10) is written to, the command byte returns to 0 (Select0 register). Registers 11 to 15 are reserved, and a command byte that references these registers is not acknowledged by the TCA6507. The upper three bits (B7–B5) of the command byte must be programmed as zeroes for proper operation. If a Stop condition occurs after the command byte is received, the TCA6507 stores the command byte and then remains idle until the I2C master sends the next operation. B7 B6 B5 B4 B3 B2 B1 B0 Figure 6. Control Register Bits Table 2. Command Byte BIT FUNCTION B7 Reserved. Must be programmed as 0. B6 Reserved. Must be programmed as 0. B5 Reserved. Must be programmed as 0. B4 Auto increment B3 Register address 3 B2 Register address 2 B1 Register address 1 B0 Register address 0 Table 3. Control Register Description CONTROL REGISTER BITS B3 B2 B1 B0 COMMAND BYTE (HEX) REGISTER PROTOCOL POWER-UP DEFAULT 0 0 0 0 0x00 Select0 Read/write byte 0000 0000 0 0 0 1 0x01 Select1 Read/write byte 0000 0000 0 0 1 0 0x02 Select2 Read/write byte 0000 0000 0 0 1 1 0x03 Fade-On Time Read/write byte 0100 0100 0 1 0 0 0x04 Fully-On Time Read/write byte 0100 0100 0 1 0 1 0x05 Fade-Off Time Read/write byte 0100 0100 0 1 1 0 0x06 First Fully-Off Time Read/write byte 0100 0100 0 1 1 1 0x07 Second Fully-Off Time Read/write byte 0100 0100 1 0 0 0 0x08 Maximum Intensity Read/write byte 1111 1111 1 0 0 1 0x09 One Shot / Master Intensity Read/write byte 0000 1111 1 0 1 0 0x10 Initialization Write byte N/A 1 0 1 1 0x11 Reserved N/A N/A 1 1 0 0 0x12 Reserved N/A N/A 1 1 0 1 0x13 Reserved N/A N/A 1 1 1 0 0x14 Reserved N/A N/A 1 1 1 1 0x15 Reserved N/A N/A Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 7 TCA6507 LOW-VOLTAGE 7-BIT I2C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 Register Descriptions The Select0 register (register 0), Select1 (register 1), and Select2 register (register 2) configure the state of each of the outputs (see Table 4) . Table 4. Select2, Select1, and Select0 Register States SELECT2 SELECT1 SELECT0 STATE 0 0 0 LED off (high impedance) 0 0 1 LED off (high impedance) 0 1 0 LED on steadily with maximum intensity value of PWM0 (ALD value or BRIGHT_F0 value) 0 1 1 LED on steadily with maximum intensity value of PWM1 (ALD value or BRIGHT_F1 value) 1 0 0 LED fully on (output low). Can be used as general-purpose output 1 0 1 LED on at brightness set by One Shot / Master Intensity register 1 1 0 LED blinking with intensity characteristics of BANK0 (PWM0) 1 1 1 LED blinking with intensity characteristics of BANK1 (PWM1) Table 5. Register 0 (Select0 Register) (1) BIT S0-7 S0-6 S0-5 S0-4 S0-3 S0-2 S0-1 S0-0 DEFAULT X (1) 0 0 0 0 0 0 0 X = Don't care Table 6. Register 1 (Select1 Register) (1) BIT S1-7 S1-6 S1-5 S1-4 S1-3 S1-2 S1-1 S1-0 DEFAULT X (1) 0 0 0 0 0 0 0 X = Don't care Table 7. Register 2 (Select2 Register) (1) BIT S1-7 S1-6 S1-5 S1-4 S1-3 S1-2 S1-1 S1-0 DEFAULT X (1) 0 0 0 0 0 0 0 X = Don't care To use a P port as a general-purpose output, Select1 and Select0 registers must be set low (or 0), then the inverse of the data written to the Select2 bit appears on the open-drain output. The intensity of each bank of LEDs can be customized by programming six registers: Fade-On Time, Fully-On Time, Fade-Off Time, First Fully-Off Time, Second Fully-Off Time, and Maximum Intensity registers. Each bank is designed to produce two identical intensity pulses per blink cycle. Both pulses have the same fade-on, fully-on and fade-off times, but independent fully-off times to achieve a double-blink effect when desired. The Fade-On Time register (register 3) defines the time from the fully-off state to the fully-on state for the LED per region A in Figure 7. The first four bits (C7–C4) in this register set the fade-on time for BANK1, and the next four bits (C3–C0) set the fade-on time for BANK0. The data for each bank is a binary number between 0 and 15. For BANK1, the MSB is bit C7, while the least significant bit (LSB) is bit C4. For BANK0, the MSB is bit C3 while the LSB is bit C0. See Table 13 for more information. Table 8. Register 3 (Fade-On Time Register) BANK 8 BANK1 BANK0 BIT C7 C6 C5 C4 C3 C2 C1 C0 DEFAULT 0 1 0 0 0 1 0 0 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 TCA6507 LOW-VOLTAGE 7-BIT I C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN 2 www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 The Fully-On Time register (register 4) defines the time spent at maximum intensity between the fade-on state and fade-off state for the LED per region B in Figure 7. The first four bits (C7–C4) in this register set the fully-on time for BANK1, and the next four bits (C3–C0) set the fully-on time for BANK0. The data for each bank is a binary number between 0 and 15. For BANK1, the MSB is bit C7, while the LSB is bit C4. For BANK0, the most significant bit (MSB) is bit C3, while the LSB is bit C0. See Table 13 for more information. Table 9. Register 4 (Fully-On Time Register) BANK BANK1 BANK0 BIT C7 C6 C5 C4 C3 C2 C1 C0 DEFAULT 0 1 0 0 0 1 0 0 The Fade-Off Time register (register 5) defines the time from the fully-on state to the fully-off state for the LED per region C in Figure 7. The first four bits (C7–C4) in this register set the fade-off time for BANK1, and the next four bits (C3–C0) set the fade-off time for BANK0. The data for each bank is a binary number between 0 and 15. For BANK1, the MSB is bit C7, while the LSB is bit C4. For BANK0, the MSB is bit C3, while the least significant bit (LSB) is bit C0. See Table 13 for more information. Table 10. Register 5 (Fade-Off Time Register) BANK BANK1 BANK0 BIT C7 C6 C5 C4 C3 C2 C1 C0 DEFAULT 0 1 0 0 0 1 0 0 The first and second Fully-Off Time registers (registers 6 and 7) define the time spent at zero intensity (in the fully-off state of the LED) per region D and E, respectively, in Figure 7. The first four bits (C7–C4) in this register set the fully-off time for BANK1, and the next four bits (C3–C0) set the fully-off time for BANK0. The data for each bank is a binary number between 0 and 15. For BANK1, the MSB is bit C7, while the LSB is bit C4. For BANK0, the MSB is bit C3, while the LSB is bit C0. See Table 13 for more information. Table 11. Register 6 (First Fully-Off Time Register) BANK BANK1 BANK0 BIT C7 C6 C5 C4 C3 C2 C1 C0 DEFAULT 0 1 0 0 0 1 0 0 Table 12. Register 7 (Second Fully-Off Time Register) BANK BANK1 BANK0 BIT C7 C6 C5 C4 C3 C2 C1 C0 DEFAULT 0 1 0 0 0 1 0 0 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 9 TCA6507 LOW-VOLTAGE 7-BIT I2C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 Table 13. Time Parameters CODE TIME (ms) 0 0 1 64 2 128 3 192 4 (default) 256 5 384 6 512 7 768 8 1024 9 1536 10 2048 11 3072 12 4096 13 5760 14 8128 15 16320 The Maximum Intensity register (register 8) defines the duty cycle of the waveform driving the LED in its fully-on state per region F in Figure 7. The first four bits (C7–C4) in this register set the duty cycle for BANK1 and the next four bits (C3–C0) set the duty cycle for BANK0. The data for each bank is a binary number between 0 and 15. For BANK1, the MSB is bit C7, while the LSB is bit C4. For BANK0, the MSB is bit C3, while the LSB is bit C0. The values in this register also define the LED intensity indicated by the BRIGHT_F0 or BRIGHT_F1 modes. The intensity of each LED is updated 125 times per second (every 8 ms with a 32-kHz clock). Table 14. Register 8 (Maximum Intensity Register) BANK BANK1 BANK0 BIT C7 C6 C5 C4 C3 C2 C1 C0 DEFAULT 1 1 1 1 1 1 1 1 Table 15. Intensity Parameters (see Figure 7) 10 REGION PARAMETER NAME PARAMETER RANGE REGISTER RANGE REGISTER NAME REGISTER A1, A2 Fade-on time 0 to 16320 ms (exponential trend) 0 to 15 Fade-On Time 2 B1, B2 Fully-on time 0 to 16320 ms (exponential trend) 0 to 15 Fully-On Time 3 C1, C2 Fade-off time 0 to 16320 ms (exponential trend) 0 to 15 Fade-Off Time 4 D First fully-off time 0 to 16320 ms (exponential trend) 0 to 15 First Fully-Off Time 5 E Second fully-off time 0 to 16320 ms (exponential trend) 0 to 15 Second Fully-Off Time 6 F Maximum intensity 0 to 100% 0 to 15 Maximum Intensity 7 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 TCA6507 LOW-VOLTAGE 7-BIT I C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN 2 www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 A1 B1 C1 D A2 B2 C2 E F or ALD Figure 7. LED Intensity Per Bank 100% Approximately 75% Intensity Approximately 25% 0% VOH I/O port Voltage VOL 8 ms 8 ms 2 ms 6 ms Figure 8. Output Port Voltage vs LED Intensity, Maximum Intensity = 100% 50% Approximately 37.5% Intensity Approximately 12.5% 0% VOH I/O port Voltage VOL 8 ms 1 ms 8 ms 4 ms 8 ms 3 ms Figure 9. Output Port Voltage vs LED Intensity, Maximum Intensity = 50% The One-Shot / Master Intensity register (register 9) (see Table 16) is an 8-bit register with three functions. Bits 0–3 set the master intensity value (ALD). It is a binary number between 0 and 15. Bits 4–5 determine whether the maximum intensity of PWM0 and PWM1 is set by the programmed F value (BRIGHT_F0 or BRIGHT_F1) or the master ALD value. The default value for these bits is 0. Bit 4 supports PWM0 and bit 5 is for PWM1. If bit 4 (or bit 5) is 0, the maximum intensity value for PWM0 (or PWM1) is set by the F value. If bit 4 (or bit 5) is 1, the maximum intensity value for PWM0 (or PWM1) is set by the master ALD value. This allows the user to vary the brightness of all LEDs by changing a single register. Bits 6–7 determine whether each PWM operates in normal or one-shot mode. Bit 6 supports PWM0 and bit 7 is for PWM1. If bit 6 (or bit 7) is 0, PWM0 (or PWM1) operates in the normal mode where the LEDs goes through the full intensity cycle defined by Table 15 and Figure 7. If bit 6 (or bit 7) is 1, PWM0 (or PWM1) operate in the one-shot mode. In this mode, the LEDs can be used to create a single-shot lighting effect where the LED intensity is valid for a particular segment of the cycle shown in Table 15 and Figure 7. Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 11 TCA6507 LOW-VOLTAGE 7-BIT I2C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 Table 16. One-Shot / Master Intensity Register BIT DESCRIPTION 0–3 Master intensity (ALD) value. Valid values are 0 to 15. 4 Determines whether maximum intensity of PWM0 is set by the programmed F value or the master ALD value 0 = F value 1 = ALD value 5 Determines whether maximum intensity of PWM1 is set by the programmed F value or the master ALD value 0 = F value 1 = ALD value 6 Determines if PWM0 operates in normal or one-shot mode 0 = Normal mode 1 = One-shot mode 7 Determines if PWM1 operates in normal or one-shot mode 0 = Normal mode 1 = One-shot mode The Initialization register (register 10) determines whether to initialize each PWM and, if so, provides the starting point of the LED intensity cycle for each bank. Bits 0–3 (C0–C3) are for BANK0 and bits 4–7 (C4–C7) are for BANK1. Bits 0–2 provide the starting point for PWM0. If bit 3 is high (or 1), it initializes PWM0. Bits 4–6 provide the starting point for PWM1. If bit 7 is high (or 1), it initialized PWM1. In the one-shot mode for BANK0, the LEDs start at the beginning of the region defined by C2, C1, and C0 in the Initialization register and, when it reaches the end of that region, the LED stays at that intensity level defined at the end of the region. When the stop point is reached, all P ports attached to PWM0 disconnect from PWM0 and stay at either the maximum intensity level for PWM0 (BRIGHT_F0 or ALD value) or the OFF state. The bits in the Select2 and Select1 registers change to reflect the final state of the LED at that time. PWM0 continues running and is free to be used by other LEDs. The one-shot mode works similarly for BANK1. Upon writing to this register, each bank is initialized to the state listed in Table 18 and Table 19. Table 17. Register 10 (Initialization Register) BANK BANK1 BIT C7 C6 BANK0 C5 C4 C3 C2 C1 C0 Table 18. BANK1 12 C6 C5 C4 0 0 0 Beginning at region A1 in Table 15 and Figure 6 INTENSITY CYCLE 0 0 1 Beginning at region B1 in Table 15 and Figure 6 0 1 0 Beginning at region C1 in Table 15 and Figure 6 0 1 1 Beginning at region D in Table 15 and Figure 6 1 0 0 Beginning at region A2 in Table 15 and Figure 6 1 0 1 Beginning at region B2 in Table 15 and Figure 6 1 1 0 Beginning at region C2 in Table 15 and Figure 6 1 1 1 Beginning at region E in Table 15 and Figure 6 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 TCA6507 LOW-VOLTAGE 7-BIT I C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN 2 www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 Table 19. BANK0 C2 C1 C0 0 0 0 Beginning at region A1 in Table 15 and Figure 6 STARTING POINT OF INTENSITY CYCLE 0 0 1 Beginning at region B1 in Table 15 and Figure 6 0 1 0 Beginning at region C1 in Table 15 and Figure 6 0 1 1 Beginning at region D in Table 15 and Figure 6 1 0 0 Beginning at region A2 in Table 15 and Figure 6 1 0 1 Beginning at region B2 in Table 15 and Figure 6 1 1 0 Beginning at region C2 in Table 15 and Figure 6 1 1 1 Beginning at region E in Table 15 and Figure 6 Power-On Reset When power (from 0 V) is applied to VCC, an internal power-on reset holds the TCA6507 in a reset condition until VCC has reached VPOR. At that point, the reset condition is released, and the TCA6507 registers and I2C/SMBus state machine initialize to their default states. After the initial power-up phase, VCCI must be lowered to below 0.2 V and then back up to the operating voltage (VCCI) for a power-reset cycle. Enable and Reset If the enable (EN) input is set to low, the TCA6507 is put in the standby or shutdown mode. In this mode, the oscillator is turned off, the registers are returned to their default state, and the the I2C/SMBus state machine is initialized. This mode is useful for low power consumption. An internal filtering circuit prevents negative glitches from accidentally shutting down the device. EN must be low for a minimum of approximately 60 µs to ensure a shutdown state. The system master can reset the TCA6507 in the event of a timeout or other improper operation by setting EN low for a minimum of approximately 60 µs. This has the same effect as a power-on reset without depowering the TCA6507. The oscillator start up time (tOSC) is measured from the point when EN is set high. Bus Transactions Data is exchanged between the master and TCA6507 through read and write commands. Reads The bus master first must send the TCA6507 address with the LSB set to a logic 0 (see Figure 5 for device address). The command byte is sent after the address and determines which register is accessed. After a restart, the device address is sent again but, this time, the LSB is set to a logic 1. Data from the register defined by the command byte then is sent by the TCA6507 (see Figure 10). Data is clocked into the register on the rising edge of the ACK clock pulse. Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 13 TCA6507 LOW-VOLTAGE 7-BIT I2C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 ACK From Slave Slave Address S 1 0 0 0 0 1 0 1 ACK From Slave Command Byte A R/W ACK From ACK From Slave Data From Register Master Slave Address A S 1 0 0 0 1 0 1 At this moment, master-transmitter becomes master-receiver, and slave-receiver becomes slave-transmitter Data 1 A A First Byte R/W Data From Register NACK From Master Data NA P Last Byte Figure 10. Read From Register Writes Data is transmitted to the TCA6507 by sending the device address and setting the LSB to a logic 0 (see Figure 5 for device address). The command byte is sent after the address and determines which register receives the data that follows the command byte (see Figure 11 through Figure 13). SCL 1 2 3 4 5 6 7 8 9 Slave Address SDA S 1 0 0 0 1 0 Start Condition Command Byte 1 0 A R/W 0 0 0 0 0 0 Data to Register 0 0 ACK From Slave Data A ACK From Slave A P ACK From Slave Figure 11. Write to Select0 Register <br/> SCL 1 2 3 4 5 6 7 8 9 Slave Address SDA S 1 0 0 0 1 0 Start Condition Command Byte 1 0 A R/W 0 0 0 0 0 0 Data to Register 0 1 ACK From Slave Data A ACK From Slave A P ACK From Slave Figure 12. Write to Select1 Register <br/> SCL 1 2 3 4 5 6 7 8 9 Slave Address SDA S 1 0 0 Start Condition 0 1 0 Command Byte 1 0 A R/W 0 0 0 0 ACK From Slave 0 1 Data to Register 0 0 Data A ACK From Slave A P ACK From Slave Figure 13. Write to Fully-On Time Register 14 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 TCA6507 LOW-VOLTAGE 7-BIT I C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN 2 www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 Absolute Maximum Ratings (1) over operating free-air temperature range (unless otherwise noted) MIN MAX VCC Supply voltage range –0.5 4.6 V VI Input voltage range (2) –0.5 6.5 V (2) UNIT VO Output voltage 6.5 V IIK Input clamp current VI < 0 SCL, EN ±20 mA IOK Output clamp current VO < 0 or VO > VCC P port, SDA ±20 mA IOL Continuous output low current VO = 0 to VCC ICC P port 50 SDA 25 Continuous current through GND 250 Continuous current through VCC 20 PW package θJA Tstg (1) (2) (3) Package thermal impedance (3) mA mA 112.6 RUE package 128 ZXU package TBD Storage temperature range –65 150 °C/W °C Stresses beyond 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 beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. The input negative-voltage and output voltage ratings may be exceeded if the input and output current ratings are observed. The package thermal impedance is calculated in accordance with JESD 51-7. Recommended Operating Conditions VCC Supply voltage of I2C registers, oscillator, and control logic VIH High-level input voltage SCL, SDA, EN VIL Low-level input voltage SCL, SDA, EN VO Output voltage 1.96 V ≤ VCC ≤ 3.6 V MAX 3.6 1.3 3.6 0.7 × VCC 3.6 Low-level output current TA Operating free-air temperature UNIT V V 1.65 V ≤ VCC ≤ 1.95 V –0.5 0.3 1.96 V ≤ VCC ≤ 3.6 V –0.5 0.3 × VCC 0 5.5 V 40 mA 85 °C (1) IOL (1) 1.65 V ≤ VCC ≤ 1.95 V MIN 1.65 –40 V The total current sourced by the P port must be limited to 200 mA. Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 15 TCA6507 LOW-VOLTAGE 7-BIT I2C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 Electrical Characteristics GND = 0 V, TA = –40°C to 85° PARAMETER TEST CONDITIONS VCC MIN TYP (1) MAX UNIT 32 43 kHz fINT Intensity control clock frequency Operating mode 1.65 V to 3.6 V 23 VIK Input diode clamp voltage II = –18 mA 1.65 V to 3.6 V –1.2 VPOR Power-on reset voltage VI = VCC or GND, IO = 0 1.65 V to 3.6 V 1.4 VOL SDA IOL = 6 mA 1.65 V to 3.6 V 0.2 SDA IOL II V V 0.6 1.65 V to 3.6 V 3 13.2 VOL = 0.5 V 1.65 V 25 59.7 VOL = 0.6 V 1.8 V to 3.6 V 40 68 SCL, SDA, EN VI = VCC or GND 1.65 V to 3.6 V EN disabled, P port idle, Intensity control disabled, SCL = VCC, SDA = VCC, IO = 0, fSCL = 0 1.65 V to 1.95 V 2 12 Standby current 1.96 V to 3.6 V 3 15 P port running, Intensity control enabled, SCL = VCC, SDA = VCC, IO = 0, fSCL = 0 1.65 V to 1.95 V 9.7 17 1.96 V to 3.6 V 10.4 20 P port running, Intensity control enabled, SDA = VCC, IO = 0, fSCL = 400 kHz 1.65 V to 1.95 V 10.2 18 1.96 V to 3.6 V 11.4 25 P port (2) ICC Operating mode V mA ±0.1 µA µA Ci SCL 1.65 V to 3.6 V 7 pF Cio SDA VIO = VCC or GND 1.65 V to 3.6 V 8 pF Co P port VO = VCC or GND 1.65 V to 3.6 V 10 pF (1) (2) 16 All typical values are at TA = 25°C. The total current sourced by the P port must be limited to 200 mA. Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 TCA6507 LOW-VOLTAGE 7-BIT I C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN 2 www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 I2C Interface Timing Requirements over recommended operating free-air temperature range (unless otherwise noted) (see Figure 14) STANDARD MODE I2C BUS FAST MODE I2C BUS MIN MAX 100 UNIT MIN MAX 0 400 fscl I2C clock frequency 0 tsch I2C clock high time 4 0.6 µs tscl I2C clock low time 4.7 1.3 µs 2 tsp I C spike time tsds I2C serial-data setup time tsdh I2C serial-data hold time ticr I2C input rise time 50 50 250 100 0 0 2 kHz ns ns ns 1000 20 + 0.1Cb (1) 300 ns 300 20 + 0.1Cb (1) 300 ns 300 20 + 0.1Cb (1) 250 ticf I C input fall time tocf I2C output fall time tbuf I2C bus free time between Stop and Start conditions 4.7 1.3 µs tsts I2C Start or repeated Start condition setup 4.7 0.6 µs tsth I2C Start or repeated Start condition hold 4 0.6 µs tsps I2C Stop condition setup 4 0.6 µs tvd(data) Valid-data time SCL low to SDA output valid 1 1 µs tvd(ack) Valid-data time of ACK condition ACK signal from SCL low to SDA (out) low 1 1 µs Cb I2C bus capacitive load 400 pF (1) 10-pF to 400-pF bus 0 400 0 ns Cb = total capacitance of one bus line in pF Oscillator Timing Requirements over recommended operating free-air temperature range (unless otherwise noted) STANDARD MODE I2C BUS MIN tOSC Oscillator start-up time from powerdown or shutdown mode to fully on at 32 kHz MAX FAST MODE I2C BUS MIN 5 UNIT MAX 5 ms Switching Characteristics over recommended operating free-air temperature range, CL ≤ 100 pF (unless otherwise noted) PARAMETER tpv Output data valid (in general-purpose output mode) tps Shutdown data valid tw EN pulse duration FROM (INPUT) TO (OUTPUT) SCL P port EN (low) P port (high) STANDARD MODE I2C BUS MIN MAX FAST MODE I2C BUS MIN 400 60 60 UNIT MAX 400 ns 60 µs 60 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 µs 17 TCA6507 LOW-VOLTAGE 7-BIT I2C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 TYPICAL CHARACTERISTICS STANDBY CURRENT vs TEMPERATURE [EN is Low (PWM Disabled), fSCL = 0] SUPPLY CURRENT vs TEMPERATURE [EN is High (PWM Enabled), fSCL = 0] 7 14 Standby Current, Istby (µA) 6 5 4 3 2 12 Supply Current, ICC (µA) 1.8 V 2.5 V 3.6 V 10 8 6 4 1.8 V 2.5 V 3.6 V 2 1 0 –40 –25 –10 5 20 0 –40 –25 –10 5 20 35 50 65 80 95 35 50 65 80 95 110 125 Temperature, TA (°C) 110 125 Temperature, TA (°C) SUPPLY CURRENT vs TEMPERATURE [EN is High (PWM Enabled), fSCL = 400 kHz] PORT OUTPUT LOW VOLTAGE vs TEMPERATURE 120 20 15 10 1.8 V 2.5 V 3.6 V 5 0 –40 –25 –10 5 20 35 50 65 Temperature, TA (°C) 80 95 110 125 Output Low Voltage, VOL (mV) Supply Current, ICC (µA) 25 100 All Outputs Loaded IL = 10 mA 80 60 40 1.8 V 2.5 V 3.6 V 20 0 –40 –25 –10 5 20 35 50 65 80 95 110 125 Temperature, TA (°C) 18 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 TCA6507 LOW-VOLTAGE 7-BIT I C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN 2 www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 TYPICAL CHARACTERISTICS (continued) PORT OUTPUT LOW VOLTAGE vs TEMPERATURE PWM FREQUENCY vs TEMPERATURE 50 128 All Outputs Loaded IL = 5 mA PWM Frequency, fPWM (Hz) Output Low Voltage, VOL (mV) 60 40 30 20 1.8 V 2.5 V 3.6 V 10 126 124 122 120 1.8 V 2.5 V 3.6 V 118 116 0 –40 -40 -25 -10 5 20 35 50 65 80 95 110 –25 –10 5 20 35 50 65 80 95 110 125 125 Temperature, TA (°C) Temperature, TA (°C) OUTPUT LOW VOLTAGE vs SINK CURRENT Low-Level Output Voltage, VOL (m V) 600 1.8 V 2.5 V 3.6 V 500 400 300 200 100 0 0 5 10 15 20 25 30 35 40 45 50 Sink Current, Isink (mA) Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 19 TCA6507 LOW-VOLTAGE 7-BIT I2C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 PARAMETER MEASUREMENT INFORMATION VCC R L = 1 kΩ DUT SDA CL = 50 pF (see Note A) SDA LOAD CONFIGURATION Three Bytes for Complete Device Programming Address Stop Start Bit 7 Address Condition Condition Bit 6 (MSB) (P) (S) Address Bit 1 tscl R/W Bit 0 (LSB) ACK (A) Data Bit 7 (MSB) Data Bit 0 (LSB) Stop Condition (P) tsch 0.7 × VCC SCL 0.3 × VCC ticr tsts tPHL ticf tbuf tsp tPLH 0.7 × VCC SDA 0.3 × VCC ticr ticf tsth tsdh tsds tsps Repeat Start Condition Start or Repeat Start Condition Stop Condition VOLTAGE WAVEFORMS BYTE DESCRIPTION 1 I2C address 2 Command 3 P-port data A. CL includes probe and jig capacitance. B. All inputs are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50 Ω, tr/tf ≤ 30 ns. C. All parameters and waveforms are not applicable to all devices. Figure 14. I2C Interface Load Circuit and Voltage Waveforms 20 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 TCA6507 LOW-VOLTAGE 7-BIT I C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN 2 www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 PARAMETER MEASUREMENT INFORMATION (continued) 500 Ω Pn DUT CL = 50 pF (see Note A) 2 × VCC 500 Ω P-PORT LOAD CONFIGURATION 0.7 × VCC SCL P0 A P3 0.3 × VCC Slave ACK SDA tpv (see Note B) Pn Unstable Data Last Stable Bit WRITE MODE (R/W = 0) A. CL includes probe and jig capacitance. B. All inputs are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50 Ω, tr/tf ≤ 30 ns. C. The outputs are measured one at a time, with one transition per measurement. D. All parameters and waveforms are not applicable to all devices. Figure 15. P-Port Load Circuit and Voltage Waveforms Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 21 TCA6507 LOW-VOLTAGE 7-BIT I2C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 APPLICATION INFORMATION Figure 16 shows a general application in which the TCA6507 can be used. Each LED output is driving one LED. Figure 16 highlights another application where the TPS61052 boost converter and high-power LED driver and TCA6507 7-bit LED driver can be used in combination for applications requiring flashlight functionality and/or high-brightness indicator/backlight LEDs. 5V VCC (1.8 V) VCC VCC 10 kW 10 kW VCC SCL SCL Master SDA Controller EN SDA P0 P1 EN P2 P3 GND General Purpose Logic P4 GND P5 P6 TCA6507 Figure 16. Typical Application L VBAT 2.2 μH SW SW VOUT COUT AVIN 10 μF Li-Ion CIN P Dx P Dy Dz P LED 2 I C I/F Flash synchronization camera engine SCL SDA ENVM FLASH_SYNC PGND AGND 1.8 V P PGND 2 I C I/F TCA6507 VCC P0 SCL P1 SDA EN P2 Voltage mode enable base-band engine GND Figure 17. White LED Flashlight Driver and High-Brightness LED Indicator/Backlight Power Supply 22 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 TCA6507 LOW-VOLTAGE 7-BIT I C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN 2 www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 SOFTWARE CONSIDERATIONS FOR USING THE TCA6507 Operation The TCA6507 includes 11 registers that control the LED function and intensity. In general, the TCA6507 needs to be operated/written this way to run LEDs (see Figure 11). 1. Master sends a START condition. 2. Master sends the slave address with a write operation (1000 1010). 3. Master sends a command byte that points 1 of the 11 registers in this device. 4. Master sends data to the TCA6507 register(s). If auto-increment mode is used, the master can write to all 11 registers with 1 command byte being sent initially. After all registers are written to (if needed), LEDs operate after the TCA6507 acknowledges the master’s command. Auto-Increment Mode In auto-increment mode, the last four bits of the command byte are automatically incremented after the byte is written and the next data byte is stored in the corresponding register. Device Address: 0001 0000, 0X02, 0X02, 0X02 Command byte: B4 = 1 enables auto-increment mode B3–B0 = 0000 points to Select0 register Data byte write to Select2 register Data byte write to Select1 register Data byte write to Select0 register The registers are written to in the order shown in Table 3. LED Operation For LED states, see Figure 1 and Table 4. It is the combination of Select2, Select1, and Select0 registers that gives the state of the LED or Px. Bit 0 from the Select0 register, bit = 0 from Select1 register and bit=0 from the Select2 register provide the state for P0 or the first LED. Similarly, bit = 1 from the Select0 register, bit 1 from Select1 register and bit = 1 from the Select2 register provide the state for P1 or the second LED (see Table 20). Table 20. LED Operation MSB LSB Select0 X 0 0 0 0 0 0 0 Select1 X 0 0 0 0 0 0 0 Select2 X 0 0 0 0 0 0 0 Output or LED affected X X P6 7th LED P5 6th LED P4 5th LED P3 4th LED P2 3rd LED P1 2nd LED P0 1st LED Example of LED Operation Starting with a powerup/reset and all seven LEDs off, the following is an example of LED operationg(using auto-increment): <start>, …, <slave addr>, <command with auto-increment>, <data>, <data>, <data>, <stop> Start, 1000 1010, 0001 0000, 0X02, 0X02, 0X02, Stop Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 23 TCA6507 LOW-VOLTAGE 7-BIT I2C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 A command byte of 0001 0000 writes first to the Select0 register. Data written is 0000 0010. Since auto-increment is enabled, the next data byte goes into Select1 and Select2 registers, respectively (see Table 21). Table 21. LED Operation Example MSB LSB Select0 X 0 0 0 0 0 1 0 Select1 X 0 0 0 0 0 1 0 Select2 X 0 0 0 0 0 1 0 Output or LED affected X X P6 7th LED P5 6th LED P4 5th LED P3 4th LED P2 3rd LED P1 2nd LED P0 1st LED For P1 or the second LED, the combination of 1 for the Select0 register (Bit 1), 1 for the Select1 register bit (bit 1), and 1 for the Select2 register bit (bit 1) puts the LED in a state where it blinks with intensity characteristic of BANK1 (PWM1) (see Table 4). Blink Control The Fade-On time, Fully-On time, Fade-Off time, First Fully-Off time, and Second Fully-Off time registers must be written to for basic blink control. Each of these registers has eight bits – top four bits for BANK1 (or PWM1) and bottom four bits for BANK0 (or PWM0) (see Table 17). Each BANK or PWM has a default value of 4 (0100), which translates to a time of 256 ms. The largest value for each BANK or PWM is 15 (1111), which translates to a time of 16320 ms (see Figure 7 and Table 15). Example of Blink Control Starting with a powerup/reset and all seven LEDs off, here is an example (using auto-increment): <start>, …, <command with auto-increment>, <data>, <data>, <data>, <data>, <data>, <data>, <data>, <data>, <stop> Start, 0001 0000, 0X02, 0X02, 0X02, 0011 0000, 0101 0000, 0011 0000, 0110 0000, 1000 0000, Stop A value of 3 is written into BANK1 in the Fade-On Time register. A value of 8 is written into BANK1 in the second Fully-Off Time register. 0011 in BANK1 = 192 ms in Fade-On time 1000 in BANK1 = 1024 ms in fully-off time (second) A value of 5 is written into BANK1 in the Fully-On Time register. A value of 6 is written into BANK1 in the First Fully-Off time register. 0101 in BANK1 = 384 ms in fully-on time 0110 in BANK1 = 512 ms in fully-off time (first) A value of 3 is written into BANK1 in the Fade-Off Time register. 0011 in BANK1 = 192 ms in fade-off time This sets the blink cycle as such for PWM1 or BANK1: 384ms 192ms 24 512ms 192ms 384ms 192ms 1024ms 192ms Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 TCA6507 LOW-VOLTAGE 7-BIT I C AND SMBus LED DRIVER WITH INTENSITY CONTROL AND SHUTDOWN 2 www.ti.com SCPS164B – MAY 2007 – REVISED NOVEMBER 2007 Intensity Control The Maximum Intensity registers must be written to for setting the intensity of the LED. This register has eight bits – top four bits for BANK1 (or PWM1) and bottom four bits for BANK0 (or PWM0). This register can be written to after sending data to the Second Fully-Off Time register (see Table 17). The Maximum Intensity register has a default value of 15 (1111), which translates to 100% brightness (see Figure 7 and Table 15). Examples of Intensity Control The intensity of the LED can be modified by changing the duty cycle of the output port voltage. The period is 8 ms. In Figure 8, 1111 0000 was written into the Maximum Intensity register to put a 100% intensity level in PWM1 or BANK1. The user can vary the duty cycle of the output voltage for intensity changes: • For 25% brightness, the voltage level at the output/LED should be LOW for 25% of the time (2 ms) and HIGH for 75% of the time (6 ms). • For 75% brightness, the voltage level at the output/LED should be LOW for 75% of the time (6 ms) and HIGH for 25% of the time (2 ms). In Figure 8, 0111 0000 was written into the Maximum Intensity register to put a 50% intensity level in PWM1 or BANK1. The period is 8 ms. The user can vary the duty cycle of the output voltage for intensity changes: • For 12.5% brightness, the voltage level at the output/LED should be LOW for 12.5% of the time (1 ms) and HIGH for 87.5% of the time (7 ms). • For 37.5% brightness, the voltage level at the output/LED should be LOW for 37.5% of the time (3 ms) and HIGH for 62.5% of the time (5 ms) Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TCA6507 25 PACKAGE OPTION ADDENDUM www.ti.com 6-Jan-2010 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Eco Plan (2) Qty TCA6507PW ACTIVE TSSOP PW 14 90 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM TCA6507PWG4 ACTIVE TSSOP PW 14 90 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM TCA6507PWR ACTIVE TSSOP PW 14 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM TCA6507PWRG4 ACTIVE TSSOP PW 14 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM TCA6507RUER ACTIVE X2QFN RUE 12 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM TCA6507ZXUR ACTIVE BGA MI CROSTA R JUNI OR ZXU 12 2500 Green (RoHS & no Sb/Br) SNAGCU Level-1-260C-UNLIM Lead/Ball Finish MSL Peak Temp (3) (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. 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Addendum-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 6-Jan-2010 TAPE AND REEL INFORMATION *All dimensions are nominal Device TCA6507PWR Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant TSSOP PW 14 2000 330.0 12.4 7.0 5.6 1.6 8.0 12.0 Q1 TCA6507RUER X2QFN RUE 12 3000 179.0 8.4 1.6 2.2 0.55 4.0 8.0 Q1 TCA6507ZXUR BGA MI CROSTA R JUNI OR ZXU 12 2500 330.0 8.4 2.3 2.8 1.0 4.0 8.0 Q2 Pack Materials-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 6-Jan-2010 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TCA6507PWR TSSOP PW 14 2000 346.0 346.0 29.0 TCA6507RUER X2QFN RUE 12 3000 220.0 205.0 50.0 TCA6507ZXUR BGA MICROSTAR JUNIOR ZXU 12 2500 340.5 338.1 20.6 Pack Materials-Page 2 MECHANICAL DATA MTSS001C – JANUARY 1995 – REVISED FEBRUARY 1999 PW (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE 14 PINS SHOWN 0,30 0,19 0,65 14 0,10 M 8 0,15 NOM 4,50 4,30 6,60 6,20 Gage Plane 0,25 1 7 0°– 8° A 0,75 0,50 Seating Plane 0,15 0,05 1,20 MAX PINS ** 0,10 8 14 16 20 24 28 A MAX 3,10 5,10 5,10 6,60 7,90 9,80 A MIN 2,90 4,90 4,90 6,40 7,70 9,60 DIM 4040064/F 01/97 NOTES: A. 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