PS501 datasheet(36/42 Pages) MICROCHIP

36 / 42 page

PS501

DS21818C-page 36

 2004 Microchip Technology Inc.

TABLE 10-3:

AC CHARACTERISTICS (TA = -20°C TO +85°C; VREG (INTERNAL) = +3.3V ± 10%)

Symbol

Characteristic

Min

Typ

Max

Units

Condition

fRC

Internal RC Oscillator Frequency

—

512.000

—

kHz

fAD

Internal A/D Clock Frequency

—

fRC/16

—

kHz

tCONV

A/D Conversion Measurement Time, n-bit + sign

—

2n/fAD

—

TABLE 10-4:

AC CHARACTERISTICS – SMBus (TA = -20°C TO +85°C;

VREG (INTERNAL) = +3.3V ± 10%)

Symbol

Characteristic

Min

Typ

Max

Units

Condition

fSMB

SMBus Clock Operating Frequency

<1.0

—

100

kHz

Slave mode

fSMB-MAS

SMBus Clock Operating Frequency

fRC/8

kHz

Master mode (Note 1)

tBUF

Bus Free Time between START and

STOP

4.7

—

µs

tSHLD

Bus Hold Time after Repeated START

4.0

—

µs

tSU:STA

Setup Time before Repeated START

4.7

—

µs

tSU:STOP

STOP Setup Time

4.0

—

µs

tHLD

Data Hold Time

300

—

µs

tSETUP

Data Setup Time

250

—

µs

tTIMEOUT

Clock Low Time-out Period

—

(Note 2)

tLOW

Clock Low Period

4.7

—

µs

tHIGH

Clock High Period

4.0

—

µs

(Note 3)

tLOW:SEXT

Message Buffering Time

—

(Note 4)

tLOW:MEXT

Message Buffering Time

—

(Note 5)

Clock/Data Fall Time

—

300

(Note 6)

Clock/Data Rise Time

—

1000

(Note 6)

Note 1:

Used when broadcasting AlarmWarning, ChargingCurrent and/or ChargingVoltage values to either a

SMBus Host or a SMBus Smart Battery Charger. This is only used when the PS501 becomes a SMBus

master for these functions. The receiving (slave) device may slow the transfer frequency. See SMBus

Tutorial in P4 User’s Guide for additional information.

The PS501 will time-out when the cumulative message time defined from Start-to-Ack, Ack-to-Ack or

Ack-to-Stop exceeds the value of tTIMEOUT, min. of 25 ms. The PS501 will reset the communication no

later than tTIMEOUT, max. of 35 ms.

tHIGH max. provides a simple method for devices to detect bus idle conditions.

tLOW:SEXT is the cumulative time a slave device is allowed to extend the clock cycles in one message

from the initial start to the stop.

tLOW:MEXT is the cumulative time a master device is allowed to extend its clock cycles within each byte of

a message as defined from Start-to-Ack, Ack-to-Ack or Ack-to-Stop.

Rise and fall time is defined as follows:

tR = (VIL

MAX -0.15) to (VIHMIN +0.15)

tF = 0.9 VDD to (VIL

MAX -0.15)

PS501 датащи(PDF) 36 Page - Microchip Technology

PS501 датащи(HTML) 36 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42

датащи скачать

ссылки URL