MAXQ3180-RAN+ datasheet(8/48 Pages) MAXIM

8 / 48 page

Low-Power, Multifunction, Polyphase AFE

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POWER-ON

RESET

CLEAR EXTCLK = 0

DRIVE RESET LOW

INITIALIZATION

MODE

SET NOINIT = 1,

DRIVE IRQ LOW

CLEAR ALL REGISTERS

TO DEFAULT STATES

CLEAR LOWPM = 0

HARDWARE

RESET

SOFTWARE

RESET

CLEAR NOINIT = 0

LPMM

(LOWPM = 1)

NORMAL

(LOWPM = 0)

POWER

MODE?

LOW-POWER

MEASUREMENT

MODE

RUN MODE

STOP MODE

CLEAR

LOWPM = 0

SET

LOWPM = 1

SET

STOPM = 1

MASTER DRIVES

SSEL LOW

SET

STOPM = 1

SET RST = 1

POWER-ON

RESET

EXTERNAL

RESET

INDICATES THAT COMMANDS FROM THE MASTER CAN BE RECEIVED IN THIS MODE.

Figure 1. Operating Modes

return to a high state, the MAXQ3180 comes out of

reset and goes into Initialization Mode. All registers

are cleared to their default states when exiting Stop

Mode in this manner.

• External Interrupt. Driving the SSEL pin low causes

the MAXQ3180 to exit Stop Mode without undergoing

a reset cycle. When exiting Stop Mode in this man-

ner, all register and configuration settings are

retained, and the MAXQ3180 automatically resumes

electric-metering functions and sample processing.

Note that when the master is communicating with the

MAXQ3180, the SSEL line is normally driven low at the

beginning of each SPI command. This means that if the

master sends an SPI command after the MAXQ3180

enters Stop Mode, the MAXQ3180 automatically exits

Stop Mode and receives the command.

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