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| 型號(hào)： | ELANSC300-25VC |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Highly Integrated, Low-Power, 32-Bit Microcontroller |
| 中文描述： | 32-BIT, 25 MHz, MICROCONTROLLER, PQFP208 |
| 封裝： | TQFP-208 |
| 文件頁(yè)數(shù)： | 56/139頁(yè) |
| 文件大小： | 1388K |
| 代理商： | ELANSC300-25VC |
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56
élanSC300 Microcontroller Data Sheet
P R E L I M I N A R Y
A portion of a typical system using a secondary power
supply to maintain the RTC and RTC RAM (and option-
ally system DRAM) is shown in Figure 3. This second-
ary power supply could be as simple as a small lithium
coin cell battery as indicated in the diagram, but is cer-
tainly not limited to this. Note that when all primary
power supply outputs are turned off, all of the system’s
peripherals are powered off (DRAM optional), all of the
élanSC300 microcontroller’s power planes are pow-
ered off except AVCC (analog) and VCC (core), and
the secondary power supply is “switched in” to maintain
the élanSC300 microcontroller’s core and analog
power source.
For more information about back-up batteries, see the
élan
TM
SC300 and élan
TM
SC310 Microcontrollers Solu-
tion For Systems Using a Back-up Battery Application
Note
, order #20746.
The RESIN pin acts as the master reset. When active,
all of the internal registers and components are reset,
including the RTC, and the RTC RAM invalid bit will be
set. This causes an issue with the power-loss bit (VRT),
Index 0Dh, bit 7 of the RTC map. The VRT bit is in-
tended to provide a method of determining when the
RTC core voltage supply has dropped below an ac-
ceptable level.
On a 146818A-compatible device, anything below
2.4 V will cause a low-battery condition and will cause
the power-loss bit to go Low. On the élanSC300 micro-
controller, the 32-KHz clock used by RTC to maintain
time stops oscillating before the VRT bit or RAM con-
tents get cleared because the VRT bit will only get
cleared when the
RESIN
pin is asserted Low. Thus, the
RTC time will be inaccurate even though the RAM con-
tents are valid and the VRT bit is still set.
Note:
Although the 32-KHz clock stops oscillating be-
fore the power-loss bit is cleared, this event occurs well
before the 2.4-V specification for proper élanSC300
microcontroller functionality.
The RESIN pin should only be asserted (pulsed) Low
when a power source is initially applied to the device’s
core and analog sections.
For more information about these notes, see the
élan
TM
SC300 and élan
TM
SC310 Microcontrollers Solu-
tion For Systems Using a Back-up Battery Application
Note
, order #20746.
The IORESET signal is intended to be the normal
“POWER GOOD” status from the primary power supply
in the example design shown in Figure 3. The IORE-
SET input does not reset the RTC and will not set the
RTC RAM invalid bit.
IORESET (when the inactive state is detected) will
cause the élanSC300 microcontroller to go through its
power-up sequence including PLL start-up for clock
generation and an internal CPU reset. See Figure 32
through Figure 35, beginning page 100, for the initial
power-up timing requirements and for Micro Power
mode exit timing.
On/Off
ACIN
élanSC300
Microcontroller
RTC
PMU
Power Supply
Swapping
Circuit
Primary
Power
Supply
Secondary
Power Supply
IORESET
M
E
M
O
R
Y
P
C
M
C
I
A
L
O
C
A
L
/
L
C
D
Main
Battery
+
3.3 V
5 V
Parallel/Serial
Power Management
Analog
ISA/LOCAL/LCD
ISA/
ISA and Misc.
RESIN
R
C
VCC
(Core)
AVCC
Figure 3.
Typical System Design with Secondary Power Supply to Maintain RTC When
Primary Power Supply is Off (DRAM Refresh is Optional.)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ELANSC300-25VI | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Highly Integrated, Low-Power, 32-Bit Microcontroller |
| ELANSC300-33KC | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Highly Integrated, Low-Power, 32-Bit Microcontroller |
| ELANSC300-33KI | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Highly Integrated, Low-Power, 32-Bit Microcontroller |
| ELANSC300-33VC | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Advanced Micro Devices 功能描述: 制造商:AMD 功能描述: |
| ELANSC300-33VI | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Highly Integrated, Low-Power, 32-Bit Microcontroller |
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