PS700 datasheet(27/38 Pages) MICROCHIP

27 / 38 page

 2004 Microchip Technology Inc.

DS21760F-page 27

PS700

4.5

Power-on Reset

When power is first applied to the VC1 input, the PS700

automatically executes a Power-on Reset sequence.

The device is held in a Reset state while the voltage is

below the minimum operating threshold, VPOR. When

the voltage on the VC1 input rises above the VPOR

threshold, the PS700 will initialize itself as described

below. When initialization is complete, the PS700 will

enter Run mode.

During the Power-on Reset sequence, the registers are

loaded with initial values from EEPROM locations

0x020-0x087. These locations are reserved to contain

tion, a Power-on Reset typically happens only at the

time of pack manufacture, when the cells are first con-

nected to the battery monitoring pcb containing the

PS700.

Data in the EEPROM locations, (Bank 0) 0:0x020-

0:0x07F, will be loaded into the corresponding register

locations in (Bank 1) 1:0x020-1:0x07F. Data in the

EEPROM locations, (Bank 1) 0:0x080-0:0x084, will be

loaded into the corresponding Cal/Setup register loca-

tions in (Bank 2) 2:0x080-2:0x084. In all cases,

EEPROM register initialization locations corre-

sponding to “Reserved” register locations must

contain the value of 0x00h in order to insure proper

operation following a Power-on Reset.

4.6

Factory Register Initialization

The EEPROM register initialization locations are pro-

grammed with a set of default values at the time that

the PS700 is manufactured. This programming results

in the following general operational state of a PS700

following a Power-on Reset:

• All accumulators and time counters disabled and

reset to ‘0’

• All A/D conversion disabled

• A/D registers programmed with their anticipated

input source, resolution and input reference

• Sample and Shelf-Sleep modes disabled

• All Sample-Sleep mode entry methods disabled

and trip point values zeroed

• GPIO inputs on VC2 and NTC disabled

• SMBus address = 0x16

• Factory calibrated trim values for band gap,

voltage reference, auxiliary oscillator and main

oscillator

Table 4-6 lists in detail the values that are programmed

into the EEPROM register initialization locations.

Note:

Do not overwrite the factory trimmed

values.

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