MAXQ3180-RAN+ datasheet(16/101 Pages) MAXIM

16 / 101 page

Low-Power, Multifunction, Polyphase AFE

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Entry into Stop Mode only occurs at the request of the

master. To place the MAXQ3180 into Stop Mode, the

master must read the ENTER STOP (0xC02) register.

Once this register has been read, the MAXQ3180

enters Stop Mode immediately, before the transmission

of the final ACK byte by the MAXQ3180.

There are three possible ways to bring the MAXQ3180

back out of Stop Mode.

• Power Cycle. The MAXQ3180 automatically exits

Stop Mode if a power-on reset occurs. Following exit

from Stop Mode, all registers are cleared back to

their default states, and the MAXQ3180 transitions to

Initialization Mode.

• External Reset. The MAXQ3180 exits Stop Mode if

an external reset is triggered by driving RESET low.

Once the RESET pin is released and allowed to

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.

Reset Sources

There are several different sources that can cause the

MAXQ3180 to undergo a reset cycle. For any type of

hardware reset, the RESET pin is driven low when a

reset occurs.

External Reset

This hardware reset is initiated by an external source

(such as the master controller or a manual pushbutton

press) driving the RESET pin on the MAXQ3180 low.

The RESET line must be held low for at least four cycles

of the currently selected clock for the external reset to

take effect. Once the external reset takes effect, it

remains in effect indefinitely as long as RESET is held

low. Once the external reset has been released, the

MAXQ3180 clears all registers to their default states

and resumes execution in Initialization Mode.

When an external reset occurs outside of Stop Mode,

execution (in Initialization Mode) resumes after four

cycles of the currently selected clock (external high-fre-

quency crystal for Run Mode, 1MHz internal RC oscilla-

tor for LOWPM Mode). As the MAXQ3180 enters

Initialization Mode, the LOWPM bit is always cleared

CLOCK

RESET

SAMPLING

INTERNAL

RESET

BEGIN RUNNING IN INITIALIZATION MODE

Figure 1. External Reset

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