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ADP1650ACBZ-R7 数据表(PDF) 14 Page - Analog Devices |
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ADP1650ACBZ-R7 数据表(HTML) 14 Page - Analog Devices |
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14 / 32 page  ADP1650 Rev. 0 | Page 14 of 32 LED CURRENT REG 0x03, I_TOR = XXX REG 0x04, OUTPUT_EN = 1 LED_MOD = 00 I2C DATA BUS 0A I(ASSIST) ADP1650 SETS OUTPUT_EN TO 0 GPIO1 (TORCH) Figure 29. . Enabling External Torch Mode Using GPIO1 TORCH-TO-FLASH MODE The driver can move directly from external torch mode (using GPIO1) to flash mode by bringing STROBE high before GPIO1 = torch is brought low. Bringing torch low before STROBE goes high prevents the flash from firing when STROBE goes high. The ADP1650 returns to standby mode after a successful flash and sets OUTPUT_EN = 0. LED CURRENT REG 0x02, FL_TIM = XXXX ms IO1_CFG = 01, TORCH REG 0x03, I_TOR = XXX mA REG 0x03, I_FL = XXXXX mA REG 0x04, OUTPUT_EN = 1 STR_LV = 1 LED_MOD = 00 I2C D ATA BUS 0A I(FLASH) STROBE ADP1650 SETS OUTPUT_EN TO 0 I(ASSIST) TORCH Figure 30. . Enabling Flash Mode from External Torch Mode TXMASK OPERATION When the ADP1650 is in flash mode, the TxMASK1 and TxMASK2 functions reduce the battery load in response to the system enabling a power amplifier. The device remains in flash mode, but the LED driver output current reduces to the pro- grammed TxMASK light level in less than 21 µs. LED CURRENT REG 0x02, IO1_CFG = 10 FL_TIM = XXXX ms REG 0x03, I_FL = XXXXX mA REG 0x06, I_TX1 = XXXX mA REG 0x04, OUTPUT_EN = 1 STR_LV = 1 LED_MOD = 10 I2C D ATA BUS 0A I(FLASH) STROBE ADP1650 SETS OUTPUT_EN TO 0. ADP1650 SETS LED_MOD TO 00. I(TXMASK1) TXMASK1 (GPIO1) FL_TX1 = 1 Figure 31. TxMASK Operation During Flash (Level-Sensitive) Mode The device selects the TxMASK1 or TxMASK2 current level based on whether TxMASK1 or TxMASK2 input is used. After a TxMASK1 or TxMASK2 occurs, a flag is set in the fault information register. When the TxMASK signal goes low again, the LED current goes back to the full flash level in a controlled manner to avoid overshoots on the battery current. If both TxMASK inputs are set high simultaneously, the TXMASK1 current level is used. FREQUENCY FOLDBACK Frequency foldback is an optional mode that optimizes efficiency by reducing the switching frequency to 1.5 MHz when VIN is slightly less than VOUT. Enable frequency foldback by setting FREQ_FB = 1 in Register 0x04. INDICATOR LED DRIVER The indicator LED driver on GPIO2 provides a programmable current source of between 2.75 mA and 11 mA for driving a red privacy LED. The current level is programmed by the I_ILED bits in Register 0x07. The circuit consists of a programmable current source and a monitoring circuit that uses comparators to determine whether the indicator LED is shorted or open. The threshold for detection of a short is 1.2 V(maximum) and an open circuit is 2.45 V(minimum). The indicator LED must not be used at the same time as a flash or assist/torch event. LOW BATTERY LED CURRENT FOLDBACK As the battery discharges, the lower battery voltage results in higher peak currents through the battery ESR, which may cause early shutdown of the phone. The ADP1650 features an optional low battery detection option, which reduces the flash current (to a programmable level) when the battery voltage falls below a programmable level. |
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