PS700 datasheet(17/38 Pages) MICROCHIP

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 2004 Microchip Technology Inc.

DS21760F-page 17

PS700

4.4.4

CTC – CHARGE TIME COUNT

CTC records the length of accumulated time that the

battery is in a charge condition as indicated by a posi-

tive voltage on the SR pin. This register is incremented

using a 2 Hz internal clock rate; therefore, the CTC is

incremented at the rate of 2 counts per second or 7200

counts per hour so long as current accumulation is

enabled and the Ires register returns a ‘0’ in the sign bit

following a current conversion.

The CTC register will rollover if it is allowed to count

beyond

0xFFFFFFFF;

therefore,

proper

maintenance by the host system is necessary. The

CTC register may be cleared using the ACCclr register

bit, CLR3, described below.

4.4.5

TA – TEMPERATURE

ACCUMULATOR

TA is the accumulated 32-bit value of temperature

measurements from the internal or external tempera-

ture sensor. TA is updated by the Itres or ETres

registers. Selection of the internal temperature sensor,

or external thermistor connected to the NTC pin, is

made in the Accumctrl register, bit tsel.

The TA register will rollover if it is allowed be updated

beyond

0xFFFFFFFF;

therefore,

proper

maintenance by the host system is necessary. The TA

CLR4, described below.

4.4.6

TAT – TEMPERATURE TIME COUNT

The TAT register records the length of accumulated

time that the PS700 is sensing temperature and accu-

mulating the value in register TA. TAT is incremented

using a 2 Hz internal clock rate and is incremented at

the rate of 2 counts per second, or 7200 counts per

hour, as long as temperature accumulation is enabled.

The TAT register will rollover if it is allowed to count

beyond

0xFFFFFFFF;

therefore,

proper

maintenance by the host system is necessary. The TAT

CLR5, described below.

4.4.7

VC2A – VC2 ACCUMULATOR

VC2A is a 32-bit register that holds the total

accumulated value measured on the VC2 pin. At the

completion

each

measurement,

VC2A

incremented by the value of VC2res. This function is

enabled when the Accumctrl register, bit AccV is a ‘1’.

The VC2A register will rollover if it is allowed to count

beyond 0xFFFFFFFF; therefore, proper register main-

tenance by the host system is necessary. The VC2A

CLR6, described below.

4.4.8

VC2T – VC2 TIME COUNT

VC2T

records

accumulated

time

for

which

measurements are taken on the VC2 pin. This register

is incremented using a 2 Hz internal clock rate; there-

fore, VC2T is incremented at the rate of 2 counts per

second or 7200 counts per hour.

The VC2T register will rollover if it is allowed to count

beyond 0xFFFFFFFF; therefore, proper register main-

tenance by the host system is necessary. The VC2T

CLR7, described below.

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