參數(shù)資料
型號(hào)： EM6821TQ52B
英文描述： Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: 0&degC to 70°C; Package: 8-EPSOIC
中文描述： 微控制器
文件頁(yè)數(shù)： 54/69頁(yè)
文件大?。?/td> 852K
代理商： EM6821TQ52B
EM6821
10/01, Revision A/386
Copyright
2001, EM Microelectronic-Marin SA
58
www.emmicroelectronic.com
18.1.4 Port SP Metal Options
Pull-up or no pull-up can be selected
for each port SP input. The pull-up is
only active in Nch. open drain mode.
Pull-down or no pull-down can be
selected for each port SP input.
The total pull value (pull-up or pull-
down) is a series resistance out of the
resistance R1
and
the
switching
transistor. As a switching transistor the
user can choose between a high
impedance (weak) or a low impedance
(strong) switch. Weak , strong or none
must be chosen. The default is strong.
The default resistor R1 value is 90
KOhm. The user may choose a
different value lower than 90kOhm.
However the value must first be
checked
and
agreed
by
EM
Microelectronic Marin SA. Refer also to
chapter 19.2 and 19.1 for the pull
values.
To select an option put an X in
column 1,2 and 4 and reconfirm the
R1 value in column 3.
The default value is : strong pull-
down with R1=90 KOhm
To select an option put an X in
column 1,2 and 4 and reconfirm the
R1 value in column 3.
The default value is : strong pull-up
with R1=90 KOhm
Figure 40. Port SP Pull Options
Resistor R1
MPSPDweak[n]
Weak Pull-down
MPSPDstrong[n]
Strong Pull-down
MPSPUweak[n]
Weak Pull-up
MPSPUstrong[n]
Strong Pull-up
Pull-up Control
PSP[n]
Terminal
100 KOhm
Pull-down
OR
Block
No Pull-up
No Pull-down
Input Circuitry
Option
Name
Strong
Pull-
down
Weak
Pull-
down
R1
Value
Typ.90k
NO
Pull-
Down
1
2
3
4
MPSPD[3]
PS3 input pull-down
MPSPD[2]
PS2 input pull-down
MPSPD[1]
PS1 input pull-down
MPSPD[0]
PS0 input pull-down
Option
Name
Strong
Pull-up
weak
Pull-up
R1
Value
Typ. 90k
NO
Pull-up
1
2
3
4
MPSPU[3]
PS3 input pull-up
MPSPU[2]
PS2 input pull-up
MPSPU[1]
PS1 input pull-up
MPSPU[0]
PS0 input pull-up
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