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参数资料
| 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： | 13/62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
20
www.emmicroelectronic.com
Pullup ON
: MPBPU[n] must be in place,
AND the bit NchOpDPB[n] must be ‘1’ ,
AND the bit PBIOCntl[n] = ‘0’ (input mode) OR if PBIOCntl[n] = ‘1’ while PBData[n] = 1.
Pullup OFF
: MPBPU[n] is not in place,
OR if MPBPU[n] is in place NchOpDPB[n] = ‘0’ cuts off the pullup,
OR if MPBPU[n] is in place and if NchOpDPB[n] = ‘1’ then PBData[n] = 0 cuts off the pullup.
Never can pull-up and pull-down be active at the same time.
For POWER SAVING one can switch off the PortB pull resistors between two read phases. No cross current flows
in the input amplifier while the PortB 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 PortB
Switch off the pull resistor
Minimum time with current on the pull resistor is 4 periods of the system clock, if the RC constant is lower than 1
system clock period. Adding a NOP before reading moves the number of periods with current in the pull resistor
to 6 and the maximum RC delay to 3 clock periods.
6.4.3 CMOS / Nchannel Open Drain Output
The PortB outputs can be configured as either CMOS or Nchannel Open Drain outputs. In CMOS both logic ‘1’
and ‘0’ are driven out on the terminal. In Nchannel Open Drain only the logic ‘0’ is driven out on the terminal, the
logic ‘1’ value is defined by the pull-up resistor (if existing).
6.4.4 PWM and Frequency output
PB[3] can also be used to output the PWM (Pulse Width Modulation) signal from the 10-Bit Counter (refer to 10-
bit Counter chapter).
PB[2:0] can be used to output three different frequencies from the RC oscillator: ck[20], ck[16] and ck[12].
-Selecting ck[20] output on PB[0] with bit PB600kHzOut in register OPTFSelPB.
-Selecting ck[16] output on PB[1] with bit PB37k5HzOut in register OPTFSelPB.
-Selecting ck[12] output on PB[2] with bit PB2k3HzOut in register OPTFSelPB.
-Selecting PWM output on PB[3] with bit PWMOn in register RegPresc.
Figure 16. CMOS or Open Drain outputs
I / O
Term inal
PB[n]
MUX
Activ e Pullup
for High State
DR[n]
Frequency
Outputs
Tri-State O utput
Buffer : High
Im pedance for
Data = 1
I / O
Term inal
PB[n]
MUX
DR[n]
Frequency
O utputs
Tri-State O utput
Buffer : closed
Data
1
CMOS Output
O pen Drain O utput
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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