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The ADC also provides continuous reading options by setting the MEAS_C bit. When MEAS_C = 1, the ADC engine

reads all enabled channels and uploads the data onto the ADC_DATAx registers every second. While continuous

measurement is enabled (MEAS_C = 1), the MEAS_S bit is ignored.

When unmasked, an interrupt (ADC_CHx_I) is triggered whenever the new data is uploaded into the corresponding data

Output-Current Measurement

The MAX77542 is capable of measuring the DC output current in each switching phase. The sampling time for the

current measurement is about 1ms per channel. The data codes in the ADC_DATA1 –ADC_DATA4 registers represent

the measured output current values of Phase1–Phase4, respectively. In multiphase configurations, a readback data of

an ADC channel still represents a measured DC output current of the corresponding phase, so that the output current

data of each phase in the same multiphase group needs to be summed for the total output current. See the Register Map

section for the conversion formula between the readback code and the measured output current.

The on-time of the low-side MOSFET given by the operating condition of the buck converter is less than 230ns

(typ), the MAX77542 is not able to measure the output current reliably and clears the corresponding status bits

(CH1_IMON_OK–CH4_IMON_OK) to 0 so that a host processor can skip reading the readback data.

Output-Voltage Measurement

The MAX77542 is also capable of measuring the DC output voltage of each switching phase. It takes about 10μs to

sample the output voltage. The data codes in the ADC_DATA5 –ADC_DATA8 registers represent the measured output

voltages of Phase1 –Phase4, respectively. In multiphase configurations, it is redundant to measure the output voltages

of slave phases in the same multiphase group if the output voltage of the master phase is already measured. See the

SYS-Voltage Measurement

The supply voltage at the SYS node (VSYS) can be monitored using the ADC CH9. There are two measurement ranges

(0V to 6.375V and 0V to 19.125V) selected by the SYS_RNG bit. It takes about 10μs to sample the input voltage. See

the Register Map section for the conversion formula between the readback code and the measured SYS voltage.

Junction-Temperature Measurement

The ADC CH10 is dedicated to measuring the junction temperature of the device. This allows a host processor to optimize

its power consumption for reliable operation. It takes about 1ms to sample the junction temperature. See the Register

Map section for the conversion formula between the readback code and the measured junction temperature.

External-Voltage Measurement

The ADC CH11 is dedicated to measuring external voltages through the ADCMUX function of the MFIOs. This feature

allows a host processor to use the ADC for general purpose (0V to 1.195V input range). It takes about 10μs to sample the

external voltage. See the Register Map section for the conversion formula between the readback code and the measured

input voltage. See the ADC Mux Input (ADCMUX) section for more information.

Detailed Description—I2C Serial Interface

The MAX77542 features a revision 3.0 I2C-compatible, 2-wire serial interface consisting of a serial clock line (SCL) and

a bidirectional serial data line (SDA). The MAX77542 is a slave-only device that relies on an external bus master to

generate the SCL clock. The SCL clock rates from 0Hz to 3.4MHz are supported. As I2C is an open-drain bus, the SCL

and the SDA require external pull-up resistors.

Slave Address

The I2C communication controller implements 7-bit slave addressing. An I2C bus master initiates communication with the

slave by issuing a start condition followed by the slave address. The MAX77542 supports four slave addresses which

is selected by RCFG1 (see the Device Configuration (CFGx) section). All slave addresses not mentioned in Table 2 are

not acknowledged. The device uses 8-bit registers with 8-bit register addressing. They support standard communication

MAX77542

16VIN/16A, Quad-Phase High-Efficiency Buck

Converter

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