AS3658F-BCTP datasheet(119/158 Pages) AMSCO

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AS3658

Data Sheet Confidential - Deta il ed Descri ption - System Functi ons

Figure 55. I

C Current-Address-Read:

To keep the access time as small as possible, this format allows a read access without the word address transfer in

advance to the data transfer. The bus is idle and the master issues a START condition followed by the Device-Read

address. Analogous to Random-Read, a single byte transfer is terminated with a not-acknowledge after the 1

byte. Analogous to Sequential-Read an unlimited number of data bytes can be transferred, where the data bytes has to

be responded with an acknowledge from the master. For termination of the transmission the master sends a not-

acknowledge following the last data byte and a subsequent STOP condition.

10.2

Reset generator and XON-Key

XRESET is a low active bi-directional pin. An external pull-up to the periphery supply has to be added.

During each reset cycle the following states are controlled by the AS3658:

Pin XRESET is forced to GND

Programmable Power-off function

Programmable Power-on sequence and regulator voltages

Programmable reset timer

All registers are set to their default values after power-on, except the reset control- and status-registers.

Note: Programming is controlled by the internal Mask-PROM and the external resistor RPROGRAM

Table 123. XRESET,XON Characteristics

Symbol

Parameter

Min

Typ

Max

Unit

Note

10.2.1 Reset Conditions

Reset can be activated from 7 different sources:

Power on (battery or charger insertion)

Low Battery

Software forced reset

Power off mode

External triggered through the pin RESET

Overtemperature

Watchdog

VXRESET_IL

XRESET Low Level

input voltage

-0.3

0.4

VXRESET_IH

XRESET High Level

input voltage

1.3

VSUPP

VXON_IL

XON Low Level input

voltage

-0.3

0.3*V2

VXON_IH

XON High Level input

0.7*V2

V2_5

IXON_PUP

XON Pull up current

µA

data 1

read register

WA++

data 2

read register

WA++

N P

WA++

…

data n

read register

WA++

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