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ACT8846 Scheda tecnica(PDF) 33 Page - Active-Semi, Inc |
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ACT8846 Scheda tecnica(HTML) 33 Page - Active-Semi, Inc |
33 / 44 page ACT8846 Rev 7.0 06-Dec-2017 Innovative PowerTM - 33 - www.active-semi.com Copyright © 2016-2017 Active-Semi, Inc. ActivePMUTM is a trademark of Active-Semi. I2CTM is a trademark of NXP. I2C Interface The ACT8846 features an I2C interface that allows advanced programming capability to enhance overall system performance. To ensure compatibility with a wide range of system processors, the I2C interface supports clock speeds of up to 400kHz (“Fast-Mode” operation) and uses standard I2C commands. I2C write-byte commands are used to program the ACT8846, and I2C read-byte commands are used to read the ACT8846’s internal registers. The ACT8846 always operates as a slave device, and is addressed using a 7-bit slave address followed by an eighth bit, which indicates whether the transaction is a read- operation or a write-operation, [1011010x]. SDA is a bi-directional data line and SCL is a clock input. The master device initiates a transaction by issuing a START condition, defined by SDA transitioning from high to low while SCL is high. Data is transferred in 8-bit packets, beginning with the MSB, and is clocked-in on the rising edge of SCL. Each packet of data is followed by an “Acknowledge” (ACK) bit, used to confirm that the data was transmitted successfully. For more information regarding the I2C 2-wire serial interface, go to the NXP website: http://www.nxp.com. Housekeeping Functions Programmable battery Voltage Monitor The ACT8846 features a programmable battery- voltage monitor, which monitors the voltage at INL2 (which should be connected directly to the battery) and compares it to a programmable threshold voltage. The VBATMON comparator is designed to be immune to noise resulting from switching, load transients, etc. The BATMON comparator is disable by default; to enable it, set the BATLEV[3:0] register to one of the value in Table 4. Note that there is a 200mV hysteresis between the rising and falling threshold for the comparator. The VBATDAT [-] bit reflects the output of the BATMON comparator. The value of VBATDAT[ ] is 1 when VINL2 < BATLEV; value is 0 otherwise. The VBATMON comparator can generate an interrupt when VINL2 is lower than BATLEV[ ] voltage. The interrupt is masked by default by can be unmasked by setting VBATMSK[ ] = 1. Table 4: BATLEV Falling Threshold Thermal Protection The ACT8846 integrates thermal shutdown protection circuitry to prevent damage resulting from excessive thermal stress, as may be encountered under fault conditions. Thermal Interrupt If the thermal interrupt is unmasked (by setting nTMSK[ ] to 1), ACT8846 can generate an interrupt when the die temperature reaches 120°C (typ). Thermal Protection If the ACT8846 die temperature exceeds 160°C, the thermal protection circuitry disables all regulators and prevents the regulators from being enabled until the IC temperature drops by 20°C (typ). FUNCTIONAL DESCRIPTION BATLEV[3:0] BATLEV Falling Threshold 0000 2.5 0001 2.6 0010 2.7 0011 2.8 0100 2.9 0101 3.0 0110 3.1 0111 3.2 1000 3.3 1001 3.4 1010 3.5 1011 3.6 1100 3.7 1101 3.8 1110 3.9 1111 4.0 |
Codice articolo simile - ACT8846_17 |
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Descrizione simile - ACT8846_17 |
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