SLUSCZ1 May   2017 TPS92518-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified Schematic
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Parameter Measurement Information
    1. 7.1 CSN Pin Falling Delay (tDEL)
    2. 7.2 Off-Timer (tOFF)
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  General Operation
        1. 8.3.1.1 Constant Off-Time vs. Constant µs×V operation
        2. 8.3.1.2 Output Equation
        3. 8.3.1.3 OFF Timer
          1. 8.3.1.3.1 Off-time and Maximum Off-time Calculations
      2. 8.3.2  Important System Considerations: Off-Timer and Maximum Peak Threshold Values
        1. 8.3.2.1 Peak Current Sense Comparator
        2. 8.3.2.2 Peak Current Threshold - LEDx _PKTH_DAC
        3. 8.3.2.3 Off-Time Thresholds - LEDx_TOFF_DAC and LEDx_MAXOFF_DAC
      3. 8.3.3  Shunt FET or Matrix dimming: Maximum Off-timer Calculation
        1. 8.3.3.1 Output Ringing and TPS92518-Q1 Protection
        2. 8.3.3.2 Live Peak and Off-Time Threshold Changes
      4. 8.3.4  VIN and the VCC Internal Regulators
      5. 8.3.5  Output Enable Control Logic
        1. 8.3.5.1 EN/UV2 - SPI Control Bypass
      6. 8.3.6  BOOT Capacitor and BOOT UVLO
      7. 8.3.7  Drop-out Operation
        1. 8.3.7.1 Early Drop-Out (Boot Capacitor Voltage >> VBOOT-UVLO)
        2. 8.3.7.2 Full Drop-Out (Boot Capacitor Voltage reaching VBOOT-UVLO)
        3. 8.3.7.3 Minimum BOOT Voltage and FET Control
        4. 8.3.7.4 BOOT Controlled internal Pull-Down
      8. 8.3.8  Analog and PWM Dimming
        1. 8.3.8.1 Dimming Methods
        2. 8.3.8.2 PWMx Pin Operation
        3. 8.3.8.3 PWM Dimming - Current Rise Performance
        4. 8.3.8.4 PWM and Analog Dimming - Linearity Limitations and Buck Converters
          1. 8.3.8.4.1 PWM:
          2. 8.3.8.4.2 ANALOG:
        5. 8.3.8.5 DCM Current Calculation
        6. 8.3.8.6 Current Sharing
      9. 8.3.9  VIN and CSPx Pin Configuration
      10. 8.3.10 Enable and Undervoltage Lock-out Configuration
      11. 8.3.11 Voltage Sampling and DAC Operation
        1. 8.3.11.1 ADC Control and LED Voltage Updating
      12. 8.3.12 Device Functional Modes
        1. 8.3.12.1 Analog Dimming
        2. 8.3.12.2 PWM Dimming
    4. 8.4 Serial Interface
      1. 8.4.1 Command Frame
      2. 8.4.2 Response Frame Formats
        1. 8.4.2.1 Read Response Frame Format
        2. 8.4.2.2 Write Response Frame Format
        3. 8.4.2.3 Write Error/POR Frame Format
        4. 8.4.2.4 SPI Error
    5. 8.5 Registers
      1. 8.5.1  CONTROL Register (Address = 00h) [reset = 00h]
        1. Table 3. CONTROL Register Field Descriptions
      2. 8.5.2  STATUS (FAULT) Register (Address = 01h) [reset = 10h]
        1. Table 4. STATUS Register Field Descriptions
      3. 8.5.3  THERM_WARN_LMT Register (Address = 02h) [reset = 80h]
        1. Table 5. THERM_WARN_LMT Register Field Descriptions
      4. 8.5.4  LED1_PKTH_DAC Register (Address = 03h) [reset = 80h]
        1. Table 6. LED1_PKTH_DAC Register Field Descriptions
      5. 8.5.5  LED2_PKTH_DAC Register (Address = 04h) [reset = 80h]
        1. Table 7. LED2_PKTH_DAC Register Field Descriptions
      6. 8.5.6  LED1_TOFF_DAC Register (Address = 05h) [reset = 80h]
        1. Table 8. LED1_TOFF_DAC Register Field Descriptions
      7. 8.5.7  LED2_TOFF_DAC Register (Address = 06h) [reset = 80h]
        1. Table 9. LED2_TOFF_DAC Register Field Descriptions
      8. 8.5.8  LED1_MAXOFF_DAC Register (Address = 07h) [reset = 80h]
        1. Table 10. LED1_MAXOFF_DAC Register Field Descriptions
      9. 8.5.9  LED2_MAXOFF_DAC Register (Address = 08h) [reset = 80h]
        1. Table 11. LED2_MAXOFF_DAC Register Field Descriptions
      10. 8.5.10 VTHERM Register (Address = 09h) [reset = 0h]
        1. Table 12. VTHERM Register Field Descriptions
      11. 8.5.11 LED1_MOST_RECENT Register (Address = 0Ah) [reset = 0h]
        1. Table 13. LED1_MOST_RECENT Register Field Descriptions
      12. 8.5.12 LED1_LAST_ON Register (Address = 0Bh) [reset = 0h]
        1. Table 14. LED1_LAST_ON Register Field Descriptions
      13. 8.5.13 LED1_LAST_OFF Register (Address = 0Ch) [reset = 0h]
        1. Table 15. LED1_LAST_OFF Register Field Descriptions
      14. 8.5.14 LED2_MOST_RECENT Register (Address = 0Dh) [reset = 0h]
        1. Table 16. LED2_MOST_RECENT Register Field Descriptions
      15. 8.5.15 LED2_LAST_ON Register (Address = 0Eh) [reset = 0h]
        1. Table 17. LED2_LAST_ON Register Field Descriptions
      16. 8.5.16 LED2_LAST_OFF Register (Address = 0Fh) [reset = 0h]
        1. Table 18. LED2_LAST_OFF Register Field Descriptions
      17. 8.5.17 Reset Register (Address = 10h) [reset = 0h]
        1. Table 19. Reset Register Field Descriptions
    6. 8.6 Programming
      1. 8.6.1 TPS92518-Q1 Register Typedef - Sample Code
      2. 8.6.2 Command Frame - Sample Code
      3. 8.6.3 SPI Read/Write - Sample Code
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
    3. 9.3 Dos and Don'ts
  10. 10Power Supply Recommendations
    1. 10.1 Input Source Direct from Battery
    2. 10.2 Input Source from a Boost Stage
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Receiving Notification of Documentation Updates
    2. 12.2 Community Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

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8.5.2 STATUS (FAULT) Register (Address = 01h) [reset = 10h]

STATUS is shown in Figure 40 and described in Table 4.

Return to Summary Table.

Figure 40. STATUS Register
8 7 6 5 4 3 2 1 0
RESERVED POWER
CYCLED		 LED2BOOTUV
ERROR		 LED1BOOTUV
_ERROR		 THERMAL
_ WARNING		 SPI
_ERROR
R-0h RtoCl-1h RtoCl-0h RtoCl-0h RtoCl-0h RtoCl-0h
1. R/W = Read/Write; R = Read Only RtoCl = Read to clear bit; -n = value after reset

Table 4. STATUS Register Field Descriptions

Bit Field Type Reset Description
8-5 RESERVED R 0

Reserved
4 POWER_CYCLED RtoCl 1

Power cycled. This bit indicates that a power-on reset has occurred since the last STATUS register read.

0h = No power cycle has occurred since the last STATUS read.

1h = A power cycle has occurred since the last STATUS read.

3 LED2_BOOTUV_ERROR RtoCl 0

Latched LED2 BOOTUV error. This bit is cleared by reading the STATUS register if the condition is no longer present.

2 LED1_BOOTUV_ERROR RtoCl 0

Latched LED1 BOOTUV error. This bit is cleared by reading the STATUS register if the condition is no longer present.

1 THERMAL_WARNING RtoCl 0

Latched thermal warning flag: This bit is cleared by reading the STATUS register if the condition is no longer present.

0h = No thermal warning has occurred since the last STATUS read.

1h = A thermal warning has occurred since the last STATUS read.

0 SPI_ERROR RtoCl 0

Latched SPI error flag

0h = No SPI error occurred since the last STATUS read.

1h = A SPI error has occurred since the last STATUS read.

POWER_CYCLED: This bit is set each time the input power is cycled to the TPS92518-Q1, including the first time the TPS92518-Q1 is powered on. To utilize this feature, read the bit as part of the start-up routine.

x_BOOTUV_ERROR: Set any time the high-side FET ‘BOOT’ drive circuit falls below VBOOT-UVLO (4.6 V typical). Note: This can be used to detect that the LED load is open, or that a drop-out condition is occurring. (any time VVIN ~= VVLEDx) For example: the LED load is removed from the output. There is no path for current flow and no increase of voltage on the sense resistor. The high-side FET remains ON requiring some current draw from the BOOT capacitor. After some time (milli-second magnitude) the capacitor is depleted, and reaches VBOOT-UVLO. At this point the high-side FET is turned off and the LEDx_BOOTUV_ERROR flag set. The boot capacitor is then be re-charged. See BOOT Capacitor and BOOT UVLO for more information.

SPI_ERROR: This error is cleared by reading the STATUS register. A SPI error is caused by any of the following conditions:

  • A non-integer-multiple of 16 clocks received during a SPI transfer
  • Any of the DATA bits are non-zero during a SPI read command
  • SPI parity error during a SPI read or write command.

The TPS92518-Q1 detects and reports certain communication and system conditions. The SPI Error status is reported with every response frame. This is useful to quickly diagnose a communication problem and attempt to fix it. On a read response frame, the TPS92518-Q1 reports the Power Cycled, Boot UV and Thermal Warning status bits, as reflected in the STATUS register. Any power and/or system faults are immediately reported on ANY read response which allows the controlling MCU to more quickly respond to system problems. (See Read Response Frame Format)
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