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ADP1650ACBZ-R7 数据表(PDF) 15 Page - Analog Devices |
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ADP1650ACBZ-R7 数据表(HTML) 15 Page - Analog Devices |
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15 / 32 page  ADP1650 Rev. 0 | Page 15 of 32 REG 0x09, I_VB_LO = XXXX mA V_VB_LO = XXX V I2C D ATA BUS STROBE ADP1650 SETS OUTPUT_EN TO 0. ADP1650 SETS LED_MOD TO 00. VIN V(V_VB_LO) REG 0x04, OUTPUT_EN = 1 LED_MOD = 10 FL_VB_LO = 1 50mV HYS GLITCH < 50µs IGNORED Figure 32. Register 0x09 Sets the Battery Voltage Threshold Level and the Reduced LED Current Level Table 6. VDD Level at Which the VBAT Low Function Is Enabled Bit Name VDD Level V_VB_LO 000 = disabled (default) 001 = 3.3 V 010 = 3.35 V 011 = 3.4 V 100 = 3.45 V 101 = 3.5 V 110 = 3.55 V 111 = 3.6 V Set V_VB_LO = 000 to disable the low battery current foldback. PROGRAMMABLE BATTERY DC CURRENT LIMIT The ADP1650 has four optional programmable input dc current limits that limit the maximum battery current that can be taken over all conditions. This allows higher LED currents to be used in a system with significant variation in LED forward voltage (VF) and supply battery voltage without risk of the current allocated to the flash being exceeded. Table 7. Input DC Current Limit Setting the LED Current Bit Name Current Limit IL_DC 00 = 1.5 A 01 = 1.75 A 10 = 2.0 A (default) 11 = 2.25 A During startup of the flash, if the battery current does not hit the dc current limit, the LED current is set to the current value of the I_FL bits. If the battery current does hit the programmed dc current limit on startup, the LED current does not increase further. The dc current limit flag is set in the fault information register. The I_FL bits in Register 0x03 are set to the actual LED current and are available for readback. REG 0x02, FL_TIM = XXXX ms REG 0x03, I_FL = XXXXX mA IL_DC_EN = 1 IL_DC = XX A I2C DATA BUS STROBE ADP1650 SETS OUTPUT_EN TO 0. ADP1650 SETS LED_MOD TO 00. NO LIMIT LED CURRENT ACTUAL LED CURRENT ADP1650 SETS FL_IDC (REG 0x05) TO 1. ADP1650 SETS I_FL TO ACTUAL LED CURRENT. REG 0x04, OUTPUT_EN = 1 STR_LV = 1 LED_MOD = 11 Figure 33. DC Current Limit Operation in a Low Battery, High LED VF Case The camera system shown in Figure 34 can adjust the image sensor settings based on the known reduced LED current for a low battery and a high VF LED. SELECT FLASH CURRENT SELECT MAX BATTERY CURRENT PREFLASH STROBE DC LIMIT HIT? LED CURRENT = PROGAMMED LED CURRENT NO LED CURRENT = REDUCED LED CURRENT YES BATTERY CURRENT = PROGRAMMED DC LIMIT I2C READ LED CURRENT ADJUST IMAGE SENSOR STROBE STROBE Figure 34. Use of the DC Current Limit in an Optimized Camera System ANALOG-TO-DIGITAL CONVERTER OPERATION The internal 4-bit analog-to-digital converter (ADC) is configurable to measure the LED VF, integrated circuit (IC) die temperature, or an external voltage using the GPIO2 pin. Read the 4-bit resolution output code back from Register 0x08 using the I2C interface. INTERFACE/ CONTROL LED_OUT SDA SCL ADC_EN[1:0] 4-BIT ADC IC TEMPERATURE SENSOR EN GPIO2 ADC_VAL[5:2] PTC Figure 35. Available ADC Modes in the ADP1650 |
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