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| 型号： | ACE1202LM8X |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | Arithmetic Controller Engine (ACEx⑩) for Low Power Applications |
| 中文描述： | 8-BIT, EEPROM, 1 MHz, MICROCONTROLLER, PDSO8 |
| 封装： | PLASTIC, SOIC-8 |
| 文件页数： | 32/39页 |
| 文件大小： | 2121K |
| 代理商： | ACE1202LM8X |
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www.fairchildsemi.com
ACE1202 Product Family Rev. B.1
A
12.0 Brown-out/Low Battery Detect Circuit
The Brown-out Reset (BOR) and Low Battery Detect (LBD)
circuits on the ACEx microcontroller have been designed to offer
two types of voltage reference comparators. The sections below
will describe the functionality of both circuits.
Figure 32: BOR/LBD Block Diagram
zero before rising back to operating range. The Brown-out Reset
can be thought of as a supplement function to the Power-on Reset
when V
CC
does not fall below ~1.5V. The Power-on Reset circuit
works best when V
CC
starts from zero and rises sharply. So in
applications where V
CC
is not constant, the BOR will give added
device stability.
The BOR circuit must be enabled through the BOR enable bit
(BOREN) in the initialization register. The BOREN bit can only be
set while the device is in programming mode. Once set, the BOR
will always be powered-up enabled. Software cannot disable the
BOR. The BOR can only be disabled in programming mode by
resetting the BOREN bit as long as the global write protect (WDIS)
feature is not enabled.
18
BOR is not available on the P.N. ACE1202B/ACE12022B device
12.2 Low Battery Detect
The Low Battery Detect (LBD) circuit allows software to monitor
the V
level at the lower voltage ranges. LBD has an eight level
software programmable voltage reference threshold that can be
changed on the fly. Once V
falls below the selected threshold,
the LBD flag in the LBD control register is set. The LBD flag will
hold its value until V
CC
rises above the threshold. (See Table 16)
The LBD bit is read only. If LBD is 0, it indicates that the V
level
is higher than the selected threshold. If LBD is 1, it indicates that
the V
level is below the selected threshold. The threshold level
can be adjusted up to eight levels using the three trim bits
(Bat_trim[2:0]) of the LBD control register. The LBD flag does not
cause any hardware actions or an interruption of the processor. It
is for software monitoring only.
The LBD function is disabled during HALT/IDLE mode. After
exiting HALT/IDLE, software must wait at least 10
μ
s before
reading the LBD bit to ensure that the internal circuit has stabi-
lized.
7
6
5
4
3
2
1
0
Adjust Reference Voltage
LBD
Control
Register
+
_
+
_
to RESET logic
Vcc
BOR
LBD
1
0
S
1.8V
2.2V
BLSEL
17
Table 16: LBD Control Register Definition
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Bat_trim[2:0]
0
X
X
X
LBD
Voltage
Reference
Level
Bat_trim[2]
Bat_trim[1]
Bat_trim[0] Range (
±
20%)
1
0
0
0
2.9 - 3.0
2
0
0
1
2.8 - 2.9
3
0
1
0
2.7 - 2.8
4
0
1
1
2.6 - 2.7
5
1
0
0
2.5 - 2.6
6
1
0
1
2.4 - 2.5
7
1
1
0
2.3 - 2.4
8
1
1
1
2.2 - 2.3
17
See Figure 14 for information on BLSEL.
12.1 Brown Out Reset
18
The Brown-out Reset (BOR) function is used to hold the device in
reset when V
drops below a fixed threshold. (See BOR Electri-
cal Characteristics for threshold voltage.) While in reset, the
device is held in its initial condition until V
CC
rises above the
threshold value. Shortly after V
rises above the threshold value,
an internal reset sequence is started. After the reset sequence, the
core fetches the first instruction and starts normal operation.
On the devices, the BOR should be used in situations when V
CC
rises and falls slowly and in situations when V
CC
does not fall to
相关PDF资料 |
PDF描述 |
|---|---|
| ACE1202LMX | Arithmetic Controller Engine (ACEx⑩) for Low Power Applications |
| ACE1202LN | Arithmetic Controller Engine (ACEx⑩) for Low Power Applications |
| ACE1202LN14 | Arithmetic Controller Engine (ACEx⑩) for Low Power Applications |
| ACE1202M | Arithmetic Controller Engine (ACEx⑩) for Low Power Applications |
| ACE1202M8 | Arithmetic Controller Engine (ACEx⑩) for Low Power Applications |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ACE1202LMX | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Arithmetic Controller Engine (ACEx⑩) for Low Power Applications |
| ACE1202LN | 功能描述:8位微控制器 -MCU arithmetic Controllr Engine RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| ACE1202LN14 | 功能描述:8位微控制器 -MCU arithmetic Controllr Engine RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| ACE1202M | 功能描述:8位微控制器 -MCU arithmetic Controllr Engine RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| ACE1202M8 | 功能描述:8位微控制器 -MCU arithmetic Controllr Engine RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
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