W83301 Winbond Electronics Corp America, W83301 Datasheet - Page 9

• Manufacturer Part Number: W83301
• Description: Acpi-str Controller
• Manufacturer: Winbond Electronics Corp America

7.Functional Description
7.1 Mode Selection
Table1, the mode A and mode B can selected via VSET0 pin. If this pin connects to 5V,
the chip will operate under mode A, otherwise the chip will operate under mode B when
VSET0 connects to ground.
voltage from ATX power supply 5V/5V
also can turn off the whole 5V
N-channel MOSFET Q3 (refer to figure) to generate a regulated voltage 2.5V
external power source 3.3V
suspend to RAM application. And In order to simply the circuit design and reduce
customer’s cost, the W83301R also integrate a bus termination controller BT driving two
external N-channel MOSFETs (Q4, Q5) to generate a specific ACPI-compliant voltage
according to a half of STR1 output for sourcing and sinking bus redundant current.
2.5V
channel MOSFET (Q3, Q4, and Q5) to generate an ACPI-compliant voltage by different
applications. Such as STR1- 2.5V
for SDRAM application, and STR3- 1.8V
an extra voltage up to 0.2V in each output for more performance but under mode A
operation, the BT output voltage will generated according to a half of STR1 output set by
VSET1.
Confidential
Mode VSET0
Mode VSET0
Table 1. W83301R Control Table
A
B
The W83301R supports two modes for customer’s multi-applications, as shown as
Both mode A and B supports a linear switch to generate an ACPI-compliant 5V
Under the mode A operation, the chip provide a linear controller STR1 that drives a
Under the mode B operation, the chip provide three linear controllers, that is STR1-
Besides, as shown in Table 1 the W83301R also provide a tri-state pin VSET1 to bias
DUAL
0V
0V
0V
5V
5V
5V
, STR2- 3.3 V
VSET1
VSET1
NC
NC
0V
5V
5V
0V
2.5V
2.6V
2.7V
2.5V
2.6V
2.7V
Revision 0.6
DUAL
STR1
STR1
DUAL
DUAL
DUAL
DUAL
DUAL
DUAL
, and STR3- 1.8V
DUAL
DL
output in S5 state via 5V
Bus Termination Controller
, the 2.5 V
3.3V
3.4V
3.5V
DUAL
STR2
DUAL
DUAL
DUAL
for clock generator application, STR2- 3.3 V
SB
1.25V
1.30V
1.35V
DUAL
according to S5# and S3# signals. And user
7
chipset application.
DUAL
DUAL
DUAL
DUAL
1.8V
1.8V
1.8V
DUAL
STR3
DUAL
DUAL
DUAL
is provide for RDRAM/DDRAM ACPI
, all of the three outputs drive a N-
-STR1 output for RDRAM/DDRAM voltage
-Bus Termination Controller for memory bus
redundant current sinking and sourcing.
-STR1 output for Clock Gen. voltage
-STR2 output for SDRAM voltage
-STR3 output for Chipset voltage
DLEN
# pin if needed.
Remark
Remark
Preliminary
DUAL
W83301R
from an
DUAL
DL