參數(shù)資料
型號(hào)： EP9301-EQ
廠商： Cirrus Logic, Inc.
英文描述： Entry-level ARM9 System-on-chip Processor
中文描述： 入門級(jí)ARM9的系統(tǒng)芯片處理器
文件頁(yè)數(shù)： 33/41頁(yè)
文件大?。?/td> 297K
代理商： EP9301-EQ
DS636PP5
Copyright 2005 Cirrus Logic (All Rights Reserved)
33
EP9301
Entry Level ARM9 System-on-Chip Processor
ADC
Note:
ADIV refers to bit 16 in the KeyTchClkDiv register.
ADIV = 0 means the input clock to the ADC module is equal to the external 14.7456 MHz clock divided by 4.
ADIV = 1 means the input clock to the ADC module is equal to the external 14.7456 MHz clock divided by 16.
Using the ADC:
This ADC has a state-machine based conversion engine that automates the conversion process. The initiator for a
conversion is the read access of the TSXYResult register by the CPU. The data returned from reading this register
contains the result as well as the status bit indicating the state of the ADC. However, this peripheral requires a delay
between each successful conversion and the issue of the next conversion command, or else the returned value of
successive samples may not reflect the analog input. Since the state of the ADC state machine is returned through the
same channel used to initiate the conversion process, there must be a delay inserted after every complete conversion.
Note that reading TSXYResult during a conversion will not affect the result of the ongoing process.
The following is a recommended procedure for safely polling the ADC from software:
1. Read the TSXYResult register into a local variable to initiate a conversion.
2. If the value of bit 31 of the local variable is '0' then repeat step 1.
3. Delay long enough to meet the maximum sample rate as shown above.
4. Mask the local variable with 0xFFFF to remove extraneous data.
5. If signed mode is used, do a sign extend of the lower halfword.
6. Return the sampled value.
Parameter
Comment
Value
Units
Resolution
No missing codes
Range of 0 to 3.3 V
50K counts (approximate)
Integral non-linearity
0.01%
Offset error
±15
mV
Full scale error
0.2%
Maximum sample rate
ADIV = 0
ADIV = 1
3750
925
Samples per second
Samples per second
Channel switch settling time
ADIV = 0
ADIV = 1
500
2
μ
s
ms
Noise (RMS) - typical
120
μ
V
Figure 21. ADC Transfer Function
0
Vref/2
Vref
0000
FFFF
61A8
9E58
A/D Converter Transfer Function
(approximately ±25,000 counts)
相關(guān)PDF資料
PDF描述
EP9301-EQZ Entry-level ARM9 System-on-chip Processor
EP9301-IQ Entry-level ARM9 System-on-chip Processor
EP9301-IQZ Entry-level ARM9 System-on-chip Processor
EP9302 High-speed ARM9 System-on-chip Processor with MaverickCrunch
EP9302-CQ Modular Connector
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
EP9301-EQZ 制造商:CIRRUS 制造商全稱:Cirrus Logic 功能描述:Entry-level ARM9 System-on-chip Processor
EP9301-IQ 功能描述:IC ARM920T MCU 166MHZ 208-LQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:EP9 標(biāo)準(zhǔn)包裝:1,500 系列:AVR® ATtiny 核心處理器:AVR 芯體尺寸:8-位 速度:16MHz 連通性:I²C，LIN，SPI，UART/USART，USI 外圍設(shè)備:欠壓檢測(cè)/復(fù)位，POR，PWM，溫度傳感器，WDT 輸入/輸出數(shù):16 程序存儲(chǔ)器容量:8KB（4K x 16） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:512 x 8 RAM 容量:512 x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 11x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:20-SOIC（0.295"，7.50mm 寬） 包裝:帶卷 (TR)
EP9301-IQZ 功能描述:微處理器 - MPU IC Entry-Level ARM9 SOC Processor RoHS:否 制造商:Atmel 處理器系列:SAMA5D31 核心:ARM Cortex A5 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:536 MHz 程序存儲(chǔ)器大小:32 KB 數(shù)據(jù) RAM 大小:128 KB 接口類型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作電源電壓:1.8 V to 3.3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FBGA-324
EP9302 制造商:CIRRUS 制造商全稱:Cirrus Logic 功能描述:High-speed ARM9 System-on-chip Processor with MaverickCrunch
EP9302A-Z 制造商:Cirrus Logic 功能描述:- Bulk
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