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| 型号： | EM6640SO18A |
| 英文描述： | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 8-SOIC |
| 中文描述： | 微控制器 |
| 文件页数： | 42/62页 |
| 文件大小： | 620K |
| 代理商： | EM6640SO18A |
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EM6640
03/02 REV. C/446
Copyright
2002, EM Microelectronic-Marin SA
47
www.emmicroelectronic.com
16. Mask Options
Most options which in many Controllers are realized as metal mask options, are directly user selectable with the
option registers allowing a maximum freedom of choice .See chapter : Option Register Memory Map.
The following options can be selected at the time of programming the metal mask ROM.
16.1 Input / Output ports
16.1.1 PortA Metal Options
Pull-Up or No Pull-Up can be
selected for each PortA input. A Pull-
up selection is excluding a Pull-down
on the same input.
Pull-Down or No Pull-Down can be
selected for each PortA input. A Pull-
down selection is excluding a Pull-up
on the same 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 (one can
not choose both). Weak, strong or
none must be chosen. The default is
strong. The default resistor R1 value
is 85kOhm. The user may choose a
different value from 85kOhm down to
0 Ohm. However the value must first
be checked and agreed by EM
Microelectronic Marin SA.
To select an option put a cross-X in
column 1,2 and 4 and reconfirm the
R1 value in column 3.
The default value is : strong pulldown
with R1=85k.
Total value of typ. 100kOhm
To select an option put a cross-X in
column 1,2 and 4 and reconfirm the
R1 value in column 3.
The default value is : strong pull-up
with R1=85k
Total value of typ. 100kOhm
By default : no pull-up
Figure 29. PortA pull options
Resistor R1
MPAPDweak[n]
weak pulldown
MPAPDstrong[n]
strong pulldown
MPAPUweak[n]
weak pullup
MPAPUstrong[n]
strong pullup
PullUp Control
PA[n]
Terminal
85 kOhm
NoPullup
NoPulldown
PullDown Control
or
Input circuitry
Option
name
strong
Pull-
Down
weak
Pull-
Down
R1
value
NO
Pull-
Down
1
2
3
4
MPAPD[3]
PA3 input pull-down
MPAPD[2]
PA2 input pull-down
MPAPD[1]
PA1 input pull-down
MPAPD[0]
PA0 input pull-down
Option
name
strong
Pull-Up
weak
Pull-Up
R1
value
NO
Pull-Up
1
2
3
4
MPAPU[3]
PA3 input pull-up
MPAPU[2]
PA2 input pull-up
MPAPU[1]
PA1 input pull-up
MPAPU[0]
PA0 input pull-up
相关PDF资料 |
PDF描述 |
|---|---|
| EM6640SO18B | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 10-DFN |
| EM6640TP16A | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 10-DFN |
| EM6640TP16B | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: 0°C to 70°C; Package: 8-SOIC |
| EM6821TQ52B | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: 0°C to 70°C; Package: 8-EPSOIC |
| EM6821TQ52D | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 8-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EM6640SO18B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| EM6640TP16A | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| EM6640TP16B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| EM6640WP11 | 制造商:EMMICRO 制造商全称:EM Microelectronic - MARIN SA 功能描述:Low Power Microcontroller with EEPROM AND RC Oscillator |
| EM6640WP27 | 制造商:EMMICRO 制造商全称:EM Microelectronic - MARIN SA 功能描述:Low Power Microcontroller with EEPROM AND RC Oscillator |
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