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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°C to 70°C; Package: 8-EPSOIC |
| 中文描述： | 微控制器 |
| 文件頁(yè)數(shù)： | 67/69頁(yè) |
| 文件大小： | 852K |
| 代理商： | EM6821TQ52B |
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EM6821
10/01, Revision A/386
Copyright
2001, EM Microelectronic-Marin SA
7
www.emmicroelectronic.com
3. Power Supply
The EM6821 is supplied by a single external power supply between VDD (Vbat) and VSS (Ground). A built-in
voltage regulator generates Vreg providing regulated voltage for the oscillator and the internal logic. The output
drivers are supplied directly from the external supply VDD. The internal power configuration is shown below in
Figure 5.
To supply the internal core logic it is possible to use either the internal voltage regulator (Vreg < VDD) or Vbat
directly ( Vreg = VDD). The selection is done by metal 1 mask option. By default the voltage regulator is used.
Refer to chapter 18.1.5 for the metal mask selection.
The internal voltage regulator is chosen for high voltage systems. It saves power by reducing the internal core
logic’s power supply to an optimum value. However, due to the inherent voltage drop over the regulator the
minimal VDD is restricted to 1.4 V .
A direct Vbat connection can be selected for systems running on a 1.5 V battery. The internal 1 KOhm resistor
together with the external capacitor on Vreg is filtering the VDD supply to the internal core. In this case the
minimum VDD can be as low as 1.2 V.
Figure 5. Internal Power Supply
Ref. Logic
Term inal
Vreg
Term inal
V bat
R ef. LCD
A ll P ad
input &
output
buffers,
SVLD
Core Logic,
LCD Logic,
O scillator
V oltage m ultiplier,
LC D outputs
M1B
M1A
1kO hm
MVreg
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