TWL2213CA

POWER SUPPLY MANAGEMENT IC AND

Li-Ion BATTERY CHARGE CONTROL

SLVS280 – MARCH 2001

7

POST OFFICE BOX 655303

detailed description (continued)

Auto power up with

adapter insertion

Adapter Attachment

VG3

VG2

VDD

PWRKIN

VREG1

PWRKOUT

CD1

XRST

PSH

CD2

CD1

Delay

VCHG

Power down by

power key insertion

CPU senses this falling

edge and drives PSH to L

Figure 2. Power-On/-Off Sequence

reset controller

The reset controller performs two major functions; one is to control the timing of delayed power-on reset, and

level. The delay time of the reset output (XRST) can be adjusted by external timing capacitance (CD1) (see

Figure 1, and Figure 2).

reaches 90% of its nominal output voltage level again, the delayed reset process starts over.