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| 型号： | ADUC832BCPZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 36/92页 |
| 文件大小： | 0K |
| 描述： | IC MCU 62K FLASH ADC/DAC 56LFCSP |
| 标准包装： | 1 |
| 系列： | MicroConverter® ADuC8xx |
| 核心处理器： | 8052 |
| 芯体尺寸： | 8-位 |
| 速度： | 16MHz |
| 连通性： | EBI/EMI，I²C，SPI，UART/USART |
| 外围设备： | PSM，温度传感器，WDT |
| 输入/输出数： | 34 |
| 程序存储器容量： | 62KB（62K x 8） |
| 程序存储器类型： | 闪存 |
| EEPROM 大小： | 4K x 8 |
| RAM 容量： | 2.25K x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 2.7 V ~ 5.5 V |
| 数据转换器： | A/D 8x12b，D/A 2x12b |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 56-VFQFN 裸露焊盘，CSP |
| 包装： | 托盘 |
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Data Sheet
ADuC832
Rev. B | Page 41 of 92
0.1F
51
BUFFER
VREF
CREF
2.5V
BAND GAP
REFERENCE
ADuC832
EXTERNAL
VOLTAGE
REFERENCE
8
7
VDD
02
98
7-
0
32
Figure 43. Using an External Voltage Reference
CONFIGURING THE ADC
The ADuC832’s successive approximation ADC is driven by a
divided down version of the master clock. To ensure adequate
ADC operation, this ADC clock must be between 400 kHz and
6 MHz, and optimum performance is obtained with ADC clock
between 400 kHz and 4.5 MHz. Frequencies within this range
can easily be achieved with master clock frequencies from 400 kHz
to well above 16 MHz with the four ADC clock divide ratios to
choose from. For example, set the ADC clock divide ratio to 4
(that is, ADCCLK = 16.78 MHz/8 = 2 MHz) by setting the
appropriate bits in ADCCON1 (ADCCON1[5:4] = 00).
The total ADC conversion time is 15 ADC clocks, plus 1 ADC
clock for synchronization, plus the selected acquisition time
(one, two, three, or four ADC clocks). For the preceding example,
with a three-clock acquisition time, total conversion time is
19 ADC clocks (or 9.05 sec for a 2 MHz ADC clock).
In continuous conversion mode, a new conversion begins each
time the previous one finishes. The sample rate is then simply
the inverse of the total conversion time previously described. In
the preceding example, the continuous conversion mode sample
rate would be 110.3 kHz.
If using the temperature sensor as the ADC input, the ADC
should be configured to use an ADCCLK of MCLK/32 and four
acquisition clocks.
Increasing the conversion time on the temperature sensor channel
improves the accuracy of the reading. To further improve the
accuracy, an external reference with low temperature drift
should also be used.
ADC DMA MODE
The on-chip ADC is designed to run at a maximum conversion
speed of 4 μs (247 kSPS sampling rate). When converting at this
rate, the ADuC832 MicroConverter has 4 μs to read the ADC
result and store the result in memory for further postprocessing;
otherwise, the next ADC sample may be lost. In an interrupt
driven routine, the MicroConverter also has to jump to the ADC
interrupt service routine, which also increases the time required
to store the ADC results. In applications where the ADuC832
cannot sustain the interrupt rate, an ADC DMA mode is
provided.
To enable DMA mode, Bit 6 in ADCCON2 (DMA) must be set.
This allows the ADC results to be written directly to a 16 MB
external static memory SRAM (mapped into data memory
space) without any interaction from the ADuC832 core. This
mode allows the ADuC832 to capture a contiguous sample
stream at full ADC update rates (247 kSPS).
A Typical DMA Mode Configuration Example
To set the ADuC832 into DMA mode, a number of steps must
be followed:
1.
The ADC must be powered down. This is done by ensuring
MD1 is set to 0 in ADCCON1.
2.
The DMA address pointer must be set to the start address
of where the ADC results are to be written. This is done by
writing to the DMA mode address pointers DMAL, DMAH,
and DMAP. DMAL must be written to first, followed by
DMAH, and then by DMAP.
3.
The external memory must be preconfigured. This consists
of writing the required ADC channel IDs into the top four
bits of every second memory location in the external SRAM,
starting at the first address specified by the DMA address
pointer. Because the ADC DMA mode operates indepen-
dent from the ADuC832 core, it is necessary to provide it
with a stop command. This is done by duplicating the last
channel ID to be converted, followed by 1111 into the next
channel selection field. A typical preconfiguration of
external memory is as follows:
1
11
1
11
00
0
11
00
01
0
01
0
1
00000AH
000000H
STOP COMMAND
REPEAT LAST CHANNEL
FOR A VALID STOP
CONDITION
CONVERT ADC CH 3
CONVERT TEMP SENSOR
CONVERT ADC CH 5
CONVERT ADC CH 2
02
987
-03
3
Figure 44. Typical DMA External Memory Preconfiguration
4.
Initiate the DMA by writing to the ADC SFRs in the
following sequence:
a.
ADCCON2 is written to enable the DMA mode, that
is, MOV ADCCON2, #40H; DMA mode enabled.
b.
ADCCON1 is written to configure the conversion
time and power-up of the ADC. It can also enable
Timer 2 driven conversions or external triggered
conversions if required.
c.
ADC conversions are initiated. This is done by
starting single conversions, starting Timer 2, running
for Timer 2 conversions, or receiving an external
trigger.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADUC832BCPZ-REEL | 功能描述:IC MCU 62K FLASH ADC/DAC 56LFCSP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC8xx 标准包装:38 系列:Encore!® XP® 核心处理器:eZ8 芯体尺寸:8-位 速度:5MHz 连通性:IrDA，UART/USART 外围设备:欠压检测/复位，LED，POR，PWM，WDT 输入/输出数:16 程序存储器容量:4KB（4K x 8） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:1K x 8 电压 - 电源 (Vcc/Vdd):2.7 V ~ 3.6 V 数据转换器:- 振荡器型:内部 工作温度:-40°C ~ 105°C 封装/外壳:20-SOIC（0.295"，7.50mm 宽） 包装:管件 其它名称:269-4116Z8F0413SH005EG-ND |
| ADUC832BS | 制造商:Analog Devices 功能描述:MCU 8-Bit ADuC8xx 8052 CISC 62KB Flash 3.3V/5V 52-Pin MQFP 制造商:Rochester Electronics LLC 功能描述:8BIT CISC 62KB FLASH 16.78MHZ 3.3/5V 52MQFP - Bulk 制造商:Analog Devices 功能描述:8BIT MCU +12BIT ADC LQFP52 832 |
| ADUC832BS-REEL | 制造商:Analog Devices 功能描述:MCU 8-Bit ADuC8xx 8052 CISC 62KB Flash 3.3V/5V 52-Pin MQFP T/R |
| ADUC832BSZ | 功能描述:IC ADC/DAC 12BIT W/MCU 52MQFP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC8xx 标准包装:250 系列:56F8xxx 核心处理器:56800E 芯体尺寸:16-位 速度:60MHz 连通性:CAN，SCI，SPI 外围设备:POR，PWM，温度传感器，WDT 输入/输出数:21 程序存储器容量:40KB（20K x 16） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:6K x 16 电压 - 电源 (Vcc/Vdd):2.25 V ~ 3.6 V 数据转换器:A/D 6x12b 振荡器型:内部 工作温度:-40°C ~ 125°C 封装/外壳:48-LQFP 包装:托盘 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323 |
| ADUC832BSZ-REEL | 功能描述:IC MCU 62K FLASH ADC/DAC 52MQFP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC8xx 标准包装:38 系列:Encore!® XP® 核心处理器:eZ8 芯体尺寸:8-位 速度:5MHz 连通性:IrDA，UART/USART 外围设备:欠压检测/复位，LED，POR，PWM，WDT 输入/输出数:16 程序存储器容量:4KB（4K x 8） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:1K x 8 电压 - 电源 (Vcc/Vdd):2.7 V ~ 3.6 V 数据转换器:- 振荡器型:内部 工作温度:-40°C ~ 105°C 封装/外壳:20-SOIC（0.295"，7.50mm 宽） 包装:管件 其它名称:269-4116Z8F0413SH005EG-ND |
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