MAX78615+PPMSLASHC01T datasheet(21/46 Pages) MAXIM

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Example: 1Watt-hr bucket with a MAX78700

In this example, the full scale is assumed to be set as

follows:

FSV = 667V; FSI = 62A

( )

Watthours Wh per count x

3600 sec / hr x SPS

BUCKET

FSV x FSI

In order to set the energy bucket to 1Wh:

1 x 3600 x 3174.6

BUCKET

276.3592

667 x 62

Therefore, the bucket register(s) value should be set as

follows:

BUCKET = BUCKETH + BUCKETL/224

BUCKETH = INT(BUCKET)

BUCKETL = (BUCKET - INT(BUCKET)) x 224

BUCKETH

= 276

= 0x000114

BUCKETL

= 0.3592

= 0x5BF722

Min/Max Tracking

The MAX78615+PPM provides a set of output registers

for tracking the minimum and/or maximum values of up

to eight (8) different low-rate measurement results over

multiple accumulation intervals. The user can select

which measurements to track through an address table.

The values in MM_ADDR# are word addresses for all

host interfaces and can be saved to flash memory by the

user as the register defaults. Results are stored in RAM

and cleared upon any power-down or reset and can be

cleared by the host using the RTRK bit in the COMMAND

Table 21. BUCKET Register Bitmap

Table 22. Min/Max Tracking Function Registers

NAME

BUCKET

BUCKETH

BUCKETL

Description

High word

Low word

Bit Position

…

Value

223

222

…

2-1

2-2

2-3

…

2-22

2-23

2-24

DESCRIPTION

TIME SCALE

MM_ADDR0

Word addresses to track minimum and maximum values. A value of

zero disables tracking for that address slot.

—

MM_ADDR1

MM_ADDR2

MM_ADDR3

MM_ADDR4

MM_ADDR5

MM_ADDR6

MM_ADDR7

MIN0

Minimum low rate value at MM_ADDR#.

Multiple intervals

MIN1

MIN2

MIN3

MIN4

MIN5

MIN6

MIN7

MAX78615+PPM

Isolated Energy Measurement Processor

for Polyphase Monitoring Systems

www.maximintegrated.com

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