LT8722

22

Rev. 0

For more information www.analog.com

SPIS_COMMAND Register

This register is used to enable and disable the device,

set the switching frequency, control the PWM output

duty cycle, set the VCC voltage, set initial peak inductor

SPI REGISTER DESCRIPTIONS

current, execute the software reset and set the linear

driver’s power loss regulation threshold.

BITS

SYMBOL

OPERATION

B[0]

ENABLE_REQ

Linear power stage is enabled when ENABLE_REQ = 1 and the SPIS_STATUS fault bits are cleared.

B[1]

SWEN_REQ

PWM switch enable request bit. Default: 0x0

1b1: Request PWM switching enable. PWM switching is enabled when SWEN_REQ = 1 and the SWEN pin is high

1b0: PWM switching is disabled.

B[4:2]

SW_FRQ_SET[2:0] PWM switch frequency control bits. Default: 0x5

3b000: 0.5MHz

3b001: 1MHz

3b010: 1.5MHz

3b011: 2MHz

3b100: 2.5MHz

3b101, 3b110, 3b111: 3MHz

B[6:5]

SW_FRQ_ADJ[1:0] PWM switch frequency adjustment bits. Default: 0x0

2b00: 0%

2b01: +15%

2b10: –15%

2b11: 0%

B[8:7]

SYS_DC[1:0]

PWM duty cycle control bits. Default: 0x0

2b00: 20%–80% duty cycle

2b01: 15%–85% duty cycle

2b10, 2b11: 10%–90% duty cycle