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参数资料
| 型号： | EM6617SO28A |
| 英文描述： | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: 0°C to 70°C; Package: 8-EPSOIC T&R |
| 中文描述： | 微控制器 |
| 文件页数： | 10/67页 |
| 文件大小： | 824K |
| 代理商： | EM6617SO28A |
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EM6617
03/02 REV. C/442
Copyright
2002, EM Microelectronic-Marin SA
18
www.emmicroelectronic.com
7.4.2 Pull-up or Pull-down
On each terminal of PB[3:0] an internal input pull-up (metal mask MPBPU[n]) or pull-down (metal mask
MPBPD[n]) resistor can be connected per metal mask option. Per default the two resistors are in place. In this
case one can chose per software to have either a pull-up, a pull-down or no resistor. See below.
For Metal mask selection and available resistor values refer to 19.1.2.
Pull-down ON
: MPBPD[n] must be in place ,
AND
bit NoPdPB[n] must be ‘0’ .
Pull-down OFF
: MPBPD[n] is not in place,
OR
if MPBPD[n] is in place NoPdPB[n] = ‘1’ cuts off the pull-down.
OR
selecting NchOpDPB[n] = ‘1’ cuts off the pull-down.
Pull-up ON
: MPBPU[n] must be in place,
AND
bit NchOpDPB[n] must be ‘1’ ,
AND
(bit PBIOCntl[n] = ‘0’ (input mode) OR if PBIOCntl[n] = ‘1’ while PBData[n] = 1. )
Pull-up OFF
: MPBPU[n] is not in place,
OR
if MPBPU[n] is in place NchOpDPB[n] = ‘0’ cuts off the pull-up,
OR
if MPBPU[n] is in place and if NchOpDPB[n] = ‘1’ then PBData[n] = 0 cuts the pull-up.
Never pull-up and pull-down can be active at the same time.
For POWER SAVING one can switch off the port B pull resistors between two read phases. No cross current
flows in the input amplifier while the port B is not read. The recommended order is :
Switch on the pull resistor.
Allow sufficient time - RC constant - for the pull resistor to drive the line to either VSS or VDD.
Read the port B
Switch off the pull resistor
Minimum time with current on the pull resistor is 4 system clock periods, if the RC time constant is lower than 1
system clock period. Adding a NOP instruction before reading moves the number of periods with current in the
pull resistor to 6 and the maximum RC delay to 3 clock periods.
7.4.3 CMOS or Nch. Output
The port B outputs can be configured as either CMOS or Nch. open drain outputs. In CMOS both logic ‘1’ and
‘0’ are driven out on the terminal. In Nch. Open Drain only the logic ‘0’ is driven on the terminal, the logic ‘1’
value is defined by the internal pull-up resistor (if implemented), or high impedance.
Figure 14. CMOS or Nch. Open Drain Outputs
I / O
T e rm inal
PB[n ]
MU X
Ac tiv e Pu ll-u p
fo r H ig h S ta te
P B D ata[n]
F requenc y
Ou tp u ts
T ri-S tate O u tput
B u ffer : H igh
Im pedanc e fo r
Da ta = 1
I / O
T e rm inal
PB[n ]
MU X
P B D ata[n]
F requenc y
Ou tp u ts
T ri-S tate O u tput
B u ffer : c los ed
Da ta
1
C M OS Ou tp u t
N c h. O pen D rain O u tput
相关PDF资料 |
PDF描述 |
|---|---|
| EM6617SO28B | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 8-EPSOIC T&R |
| EM6617TP28A | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: 0°C to 70°C; Package: 8-EPSOIC T&R |
| EM6617TP28B | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 8-EPSOIC T&R |
| EM6640SO18A | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 8-SOIC |
| EM6640SO18B | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 10-DFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EM6617SO28B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| EM6617TP28A | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| EM6617TP28B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| EM6617WP11 | 制造商:EMMICRO 制造商全称:EM Microelectronic - MARIN SA 功能描述:Ultra Low Power Microcontroller with ADC AND EEPROM |
| EM6617WP27 | 制造商:EMMICRO 制造商全称:EM Microelectronic - MARIN SA 功能描述:Ultra Low Power Microcontroller with ADC AND EEPROM |
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