ACT43750 datasheet(17/43 Pages) QORVO

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Data Sheet Rev. F, February 10, 2025 | Subject to change without notice

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ACT43750

RF POL Drain-Switch Driver / Gate-bias Regulator

External Configuration Resistors

The ACT43750 contains additional functionality pro-

grammed with external resistors connected to the

CONF pin. During power-up, the ACT43750 uses a five-

bit analog-to-digital converter (5-bit ADC) to read the

voltage at the CONF pin. It calculates the voltage on

CONF as a percentage of the V5 voltage (typically 5V)

and generates a 5-bit output. The resulting 5 bits

(RCONF[4:0]) overwrite the default bits except bit [3] in

the default CMI settings. The external configuration re-

sistors change the following functionality.

•

Sets the clock as a master or slave

•

Enables or disables the SYNC pin as an output

in slave mode

•

Sets the SYNC pin input polarity as rising or

falling edges when in slave mode

•

Sets the Slave I2C Address

Not all the RCONF[4:0] bits translate directly into the

bits in register 0x11h. Table 3 shows how each 0x11h

Table 3. Register 0x11 Bits

RCONF[4:0] bit

0x11h Bit 7

Not used

0x11h Bit 6

RCONF[4]

0x11h Bit 5

RCONF[3]

0x11h Bit 4

RCONF[3]

0x11h Bit 3

Set by the default CMI

0x11h Bit 2

RCONF[2]

0x11h Bit 1

RCONF[1]

0x11h Bit 0

RCONF[0]

Refer to Table 5 and the ACT43750 register definition

application note for details. Shorting CONF to ground

disables the CONF startup routine and keeps the de-

fault register values.

Figure 4 shows the CONF resistor connection, and Ta-

ble 5 shows the required resistor divider values and the

resulting 5-bit binary value.

I2C Slave Address

The 7-bit I2C Slave address is generated by a combina-

tion of fixed values, a default register setting defined by

the CMI, and the RCONF values. The table 4 shows

how the 7-bit I2C Slave address is generated. It is a sim-

plified version of Table 5

Table 4. 7-Bit I2C Slave Address Bits

–Bit I2C Slave Address Bits

Bit 7

Always = 0

Bit 6

Always = 1

Bit 5

= Reg11[3]

Bit 4

Always = 0

Bit 3

=Reg11[3]=RCONF[2]

Bit 2

=Reg11[2]=RCONF[1]

Bit 1

=Reg11[1]=RCONF[0]

Bit 0

I2C Read/Write Bit

5-bit

ADC

RCONF[4:0]

CONF

AGND

ACT43750

Figure 4. The CONF Pin Connection

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