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ACT4911QW Datasheet(PDF) 25 Page - Active-Semi, Inc |
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ACT4911QW Datasheet(HTML) 25 Page - Active-Semi, Inc |
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25 / 33 page  ACT4911QW Rev 1.0, 15-Sept-2017 Innovative PowerTM www.active-semi.com ActiveSwitcherTM is a trademark of Active-Semi Copyright © 2017 Active-Semi, Inc. 25 The ACT4911 allows for very flexible health checking routines by allowing the system to manually enable the 10mA discharge current by setting the EN_STR10mASINK bit = 1. In this situation, the system manually turns the discharge current on and off. The storage capacitor voltage threshold is still determined by the HMON_THR register. This function is useful for checking extremely large capacitor values which need very long discharge times. PG_THR (Programmable) VSTR Initial Charge Health Testing Top-Off Maintain V 10mA 50mA I 200us Programmable Discharge Time Programmable Interval Time t t 0 0 Storage Cap Voltag e Discharge Current Figure 6: Storage Voltage at Different Stages The register HMON_TSET [3:0] sets the health check discharge time as shown in Table 7. This also allows the use of the ADC to check the slope of the discharge and calculate the capacitance. Table 7: Health Check Discharge Time HMON_TSET[2:0] HMON_TSET[3] (ms) 0 1 000 2 384 001 4 512 010 8 640 011 16 768 100 32 896 101 64 1024 110 128 1152 111 256 1280 ADC Monitoring General Description The ACT4911 contains a built-in analog to digital con- verter, ADC, which can be used to monitor five system level parameters. These include input voltage, output voltage, storage capacitor voltage, eFuse current, and die temperature. It is a single 8 bit delta-sigma ADC that uses an analog input multiplexer to select one of six channels for the A/D conversion. The resulting digital results are stored in six digital registers. A six to one multiplexer connects one of the ADC output registers to the user accessible register map. ADC Configuration The ACT4911 ADC is configured through the I2C interface. It is enabled and disabled by the EN_ADC register bit. The ADC has two conversion modes, manual single-shot conversion and automatic polling conversion. Single-Shot Conversion Configure the IC for single-shot conversion mode by setting the following I2C bits in register 0x08h ADC_ONE_SHOT = 1. ADC_CH_SCAN = 0 EN_ADCBUF = 1 In single shot mode, the user defines the input channel to be converted and then manually initiates the ADC conversion. I2C bits ADC_CH_CONV [2:0] in register 0x08h select the input channel to be converted. ADC_CH_READ [2:0] selects the ADC channel to be read. These should be set to the same channel. The user initiates an ADC read by writing a 1 into EN_ADC in register 0x08h. When ADC conversion is complete, the ADC_DATA_READY bit (register 0x07h [7]) is set to 1, nIRQ is asserted low, and EN_ADC automatically changes back to 0. The uP can then read the status bits to find that the ADC conversion is complete. The ADC data are stored in ADC_DOUT [13:6] in register 0x05h. nIRQ stays asserted low and the ADC_READY_BIT stays equal to 1 until the ADC data is read. Reading the ADC data automatically deasserts nIRQ. To initiate another ADC conversion for the same channel, set EN_ADC=1. To initiate an ADC conversion for another channel, change ADC_CH_CONV and ADC_CH_READ to the appropriate channel and then set EN_ADC=1. |
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