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參數(shù)資料
| 型號： | EM6821TQ52B |
| 英文描述： | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: 0°C to 70°C; Package: 8-EPSOIC |
| 中文描述： | 微控制器 |
| 文件頁數(shù)： | 53/69頁 |
| 文件大?。?/td> | 852K |
| 代理商： | EM6821TQ52B |
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EM6821
10/01, Revision A/386
Copyright
2001, EM Microelectronic-Marin SA
57
www.emmicroelectronic.com
18.1.3 Port B Metal Options
Pull-up or no pull-up can be
selected for each port B input. The
pull-up is only active in Nch. open
drain mode.
Pull-down or no pull-down can be
selected for each port B 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 90 kOhm. 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 39. Port B Pull Options
Resistor R1
MPBPDweak[n]
Weak Pull-down
MPBPDstrong[n]
Strong Pull-down
MPBPUweak[n]
Weak Pull-up
MPBPUstrong[n]
Strong Pull-up
Pull-Up Control
PB[n]
Terminal
100 KOhm
Pull-down Control
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
MPBPD[3]
PB3 input pull-down
MPBPD[2]
PB2 input pull-down
MPBPD[1]
PB1 input pull-down
MPBPD[0]
PB0 input pull-down
Option
Name
Strong
Pull-up
Weak
Pull-up
R1
value
Typ. 90k
NO
Pull-up
1
2
3
4
MPBPU[3]
PB3 input pull-up
MPBPU[2]
PB2 input pull-up
MPBPU[1]
PB1 input pull-up
MPBPU[0]
PB0 input pull-up
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