71M6545HT-IGTRSLASHF datasheet(43/66 Pages) MAXIM

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71M6545T/71M6545HT

Energy Meter ICs

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sponding offsets relative to the Info Page base address.

After reading the desired Info Page information, the MPU

must reset the INFO_PG bit. The code below provides

an example for reading Info Page fuse trims. In this

code example, the address, px is a pointer to the MPU’s

code space. In assembly language, the Info Page data

objects, which are read-only, must be accessed with the

MOVC 8051 instruction. In the C-language, Info Page

trim fuses must be fetched with a pointer of the correct

width, depending on the format of the trim fuse (an 8-bit

or a 16-bit data object). The case statements in the code

example below perform casts to obtain a pointer of the

correct size for each object, as needed.

In assembly language, the MPU has to form 11-bit or

16-bit values from two separate 8-bit fetches, depending

on the object being fetched. The byte values containing

less than 8 valid bits are LSB justified. For example Info

Page offset 0x90 is an 8-bit object whose three LSBs are

bits [10:8] of the complete TEMP_85[10:0] 11-bit object.

The Info Page data objects are 2s complement format

and should be sign-extended when read into a 16-bit data

type (see case _TEMP85 in the code example).

#if HIGH_PRECISION_METER

int16_t read_trim (enum eTRIMSEL

select) {

uint8r_t *px;

int16_t x;

px = ((uint16_t)select) +

((uint8r_t *)(CE3 << 10));

switch (select)

{

default:

case _TRIMBGD:

INFO_PG = 1;

x = *px;

INFO_PG = 0;

break;

case _TRIMBGB:

INFO_PG = 1;

x = *(uint16r_t*)px;

INFO_PG = 0;

break;

case _TEMP85:

INFO_PG = 1;

x = *(uint16r_t*)px;

INFO_PG = 0;

if (x & 0x800) x |= 0xF800;

break;

}

return (x); }

#endif //#if HIGH_PRECISION_METER

Table 11. Info Page Trim Fuses

DEFINITION

LOCATION

ADDRESS

FORMAT

TYPICAL VALUE

STEMP_T85_P

STEMP at +85C

Info Block

0xAA, 0xAB

16 bits, signed

4400

STEMP_T22_P

STEMP at +22C

Info Block

0x8A, 0x8B

13 bits, unsigned

3600

T85_P

Probe temperature at +85C

Info Block

0xA6, 0xA7

16 bits signed

605

T22_P

Probe temperature at +22C

Info Block

0x9A

8 bits signed

STEMP

Temperature sensor

I/O RAM

0x2882,

0x2882

11 bits, sign extended

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