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XRP6840BILBTR-F Datasheet(PDF) 10 Page - Exar Corporation |
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XRP6840BILBTR-F Datasheet(HTML) 10 Page - Exar Corporation |
10 / 17 page X XR RP P6 68 84 40 0 4 4..3 3A A S Su up pe errcca ap pa acciitto orr F Flla as sh h L LE ED D D Drriiv ve err w wiitth h II22C C © 2009 Exar Corporation 10/17 Rev. 1.0.0 APPLICATION INFORMATION I2C SERIAL INTERFACE REGISTERS The XRP6840 has five serially programmable data registers via the I²C interface. These registers can be reset to ‘0’ through power on reset or setting RESET_N, pin 6, to ‘0’. The first register is for Device Address as shown in Figure 3; it is activated by ‘28’ HEX (7-bit format). The second register, STATUS1, contains the control word for programming operating modes, shutdown control, charge pump modes and flash timeout. The third register, STATUS2, contains the flash voltage level, read back of the Flash Ready, and fault conditions UVLO and over temperature. The fourth register, LEDFLASH, controls individual LED channels and current level in Flash Mode. The fifth register, LEDTORCH, controls individual LED channels and current level in Torch Mode. Register B7 B6 B5 B4 B3 B2 B1 B0 Address 0 1 0 1 0 0 0 R/W STATUS1 Flash Torch Mode Flash Torch Mode Shut Down Control Gain Gain - Flash Timeout Flash Timeout STATUS2 Flash V Flash V Flash V Flash Ready UVLO Fault Temp Fault 0 0 LEDFLASH LED1 LED2 LED3* D2 D1 D0 - - LEDTORCH LED1 LED2 LED3* D3 D2 D1 D0 - Table 1: XRP6840 I2C Registers Bit Map * Not used for XRP6840B STATUS1 Register STATUS1 Register Bits B7, B6, B4 and B3 B7 B6 B4 B3 Operation Mode 0 1 0 0 High Efficiency Torch Mode 0 1 0 1 1X Torch Mode 0 1 1 0 1.5X Torch Mode 0 1 1 1 2X Torch Mode 1 0 0 0 Auto Gain Torch Mode 1 0 0 1 1X Torch Mode 1 0 1 0 1.5X Torch Mode 1 0 1 1 2X Torch Mode 1 1 0 0 Auto Gain Flash Mode 1 1 0 1 1X Flash Mode 1 1 1 0 1.5X Flash Mode 1 1 1 1 2X Flash Mode Table 2: STATUS1 Register Operation Modes STATUS1 Register Bit B5 This bit is used to save or reset the contents of STATUS1, STATUS2, LEDFLASH and LEDTORCH registers for the next I2C command when RESET_N, pin 6, is ‘1’. If B5 is ‘1’ then all bits in these registers will be saved. Otherwise if B5 is ‘0’ then all bits will be reset to ‘0’. STATUS1 Register Bits B1 and B0 These two bits program the flash timeout duration as follows: B1 B0 Flash Duration 0 0 0.11s 0 1 0.22s 1 0 0.53s 1 1 1.10s Table 3: Charge Pump Mode Selection STATUS2 Register Flash Mode Voltage Programming VOUT_LIMIT in Flash Mode is regulated with 50mV of hysteresis and is programmed through bits B7, B6 and B5 of STATUS2 register as follows: B7 B6 B5 Comment 0 0 0 4.55V 0 0 1 4.70V 0 1 0 4.85V 0 1 1 5.00V 1 0 0 5.15V 1 0 1 5.30V 1 1 0 5.45V 1 1 1 5.60V Table 4: Flash Mode VOUT_LIMIT Settings Bit B4 RDY bit is available for I2C read-back. This bit is set to ‘1’ when VOUT > VOUT_LIMIT, and set to ‘0’ otherwise. Fault mode read-back bits B3, B2 These bits are designed for 2 Fault Mode flags and are also available for I2C read-back. Bits 3 and 2 are set to ‘1’ when UVLO and over temperature conditions are detected, as shown in Table 1. LEDFLASH Register LEDFLASH register, bits B7, B6 and B5 are used to activate the LED outputs channels as summarized in Table 1; they correspond to LED1, LED2 and LED3. Bits B4, B3 and B2 |
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