MAXQ3180-RAN+ datasheet(98/101 Pages) MAXIM

98 / 101 page

Low-Power, Multifunction, Polyphase AFE

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Phasors

Phase B Phasor (VBPH: 0x852)

This register reports phase angle of voltage phase B

with respect to voltage phase A. The value is

expressed in units of 0.01 degree; thus, the nominal

value is 12000 decimal (0x2EE0). This value is calculat-

ed based on zero-crossing detection. It may exhibit

noticable error in the presence of harmonics on voltage

channels. This register is 2 bytes wide.

Phase C Phasor (VCPH: 0x854)

This register reports phase angle of voltage phase C

with respect to voltage phase A. The value is

expressed in units of 0.01 degree; thus, the nominal

value is 24000 decimal (0x5DC0). This value is calcu-

lated based on zero-crossing detection. It may exhibit

noticable error in the presence of harmonics on voltage

channels. This register is 2 bytes wide.

Harmonics

RMS Voltage, Harmonic (V.HARM) (0x830)

This register reports the RMS voltage. The units are

defined by the VOLT_CC setting. Use AUX_CFG to

configure the phase (A/B/C) and harmonic order

desired.

RMS Current, Harmonic/Neutral (I.N, I.HARM) (0x840)

This register reports the harmonic RMS current of

selected phase (A/B/C) and harmonic order, harmonic,

or the RMS current of the neutral current channel. The

units are defined by the AMP_CC setting. Use

AUX_CFG to configure the phase (A/B/C) and harmonic

order desired.

Ratio of Harmonic/Fundamental (HARM_NF) (0x850)

This register reports the ratio of the selected harmonic

RMS over the fundamental RMS of the same signal

(except IN). The master must configure the AUX_CFG

and select AUX_MUX before reading this register. This

Special Commands

Table 7 shows the read-only virtual registers that acti-

vate special commands when read by the master.

Some commands return dummy values.

Applications Information

Grounds and Bypassing

Careful PCB layout significantly minimizes noise on the

analog inputs, resulting in less noise on the digital I/O

that could cause improper operation. The use of multi-

layer boards is essential to allow the use of dedicated

power planes. The area under any digital components

should be a continuous ground plane if possible. Keep

any bypass capacitor leads short for best noise rejec-

tion and place the capacitors as close to the leads of

the devices as possible.

The MAXQ3180 must have separate ground areas for

the analog (AGND) and digital (DGND) portions, con-

nected together at a single point.

NAME

ADDRESS

DESCRIPTION

DATA

LENGTH

(BYTES)

UPD_SFR

0x900

Reading this register copies the mirror registers (R_ADCF, R_ADCRATE,

R_ADCACQ, R_SPICF) into hardware SFR registers. The read returns dummy data.

UPD_MIR

0xA00

Reading this register copies hardware SFR registers into mirror registers (R_ADCF,

R_ADCRATE, R_ADCACQ, R_SPICF). The read returns dummy data.

DSPVER

0xC00

Reading this register returns the DSP firmware version number.

RAWTEMP

0xC01

Reading this register initiates the sampling and averaging of two internal

temperature readings. The result in internal temperature units is read from this

Celsius: T[c] = T[raw] x TempFactor - 273.15

where TempFactor is a value to be determined by calibration. Note that the final

value may be slightly higher than ambient due to internal die heating.

ENTER STOP

0xC02

Reading this register places the device into Stop Mode.

ENTER LOWPM

0xC03

Reading this register places the device into LOWPM Mode.

EXIT LOWPM

0xC04

Reading this register exits LOWPM Mode.

Table 7. Virtual Registers That Activate Special Commands

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