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參數(shù)資料
| 型號： | AT91SAM7X256B-CU |
| 廠商： | Atmel |
| 文件頁數(shù)： | 18/44頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU 256KB FLASH 100TFBGA |
| 產(chǎn)品培訓模塊： | SAM9 MPU Boot Solutions & Application Deployment AT91SAM7X and SAM7XC Flash-based Microcontrollers MCU Product Line Introduction |
| 標準包裝： | 260 |
| 系列： | SAM7X |
| 核心處理器： | ARM7 |
| 芯體尺寸： | 16/32-位 |
| 速度： | 55MHz |
| 連通性： | CAN，以太網(wǎng)，I²C，SPI，SSC，UART/USART，USB |
| 外圍設備： | 欠壓檢測/復位，DMA，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 62 |
| 程序存儲器容量： | 256KB（256K x 8） |
| 程序存儲器類型： | 閃存 |
| RAM 容量： | 64K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 1.65 V ~ 1.95 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 8x10b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 100-TFBGA |
| 包裝： | 托盤 |
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25
6120GS–ATARM–07-Apr-11
SAM7X512/256/128 Summary
9.1
Reset Controller
Based on one power-on reset cell and one brownout detector
Status of the last reset, either Power-up Reset, Software Reset, User Reset, Watchdog
Reset, Brownout Reset
Controls the internal resets and the NRST pin output
Allows to shape a signal on the NRST line, guaranteeing that the length of the pulse meets
any requirement.
9.1.1
Brownout Detector and Power-on Reset
The SAM7X512/256/128 embeds one brownout detection circuit and a power-on reset cell. The
power-on reset is supplied with and monitors VDDCORE.
Both signals are provided to the Flash to prevent any code corruption during power-up or power-
down sequences or if brownouts occur on the power supplies.
The power-on reset cell has a limited-accuracy threshold at around 1.5V. Its output remains low
during power-up until VDDCORE goes over this voltage level. This signal goes to the reset con-
troller and allows a full re-initialization of the device.
The brownout detector monitors the VDDCORE and VDDFLASH levels during operation by
comparing them to a fixed trigger level. It secures system operations in the most difficult environ-
ments and prevents code corruption in case of brownout on the VDDCORE or VDDFLASH.
When the brownout detector is enabled and VDDCORE decreases to a value below the trigger
level (Vbot18-, defined as Vbot18 - hyst/2), the brownout output is immediately activated.
When VDDCORE increases above the trigger level (Vbot18+, defined as Vbot18 + hyst/2), the
reset is released. The brownout detector only detects a drop if the voltage on VDDCORE stays
below the threshold voltage for longer than about 1s.
The VDDCORE threshold voltage has a hysteresis of about 50 mV, to ensure spike free brown-
out detection. The typical value of the brownout detector threshold is 1.68V with an accuracy of
± 2% and is factory calibrated.
When the brownout detector is enabled and VDDFLASH decreases to a value below the trigger
level (Vbot33-, defined as Vbot33 - hyst/2), the brownout output is immediately activated.
When VDDFLASH increases above the trigger level (Vbot33+, defined as Vbot33 + hyst/2), the
reset is released. The brownout detector only detects a drop if the voltage on VDDCORE stays
below the threshold voltage for longer than about 1s.
The VDDFLASH threshold voltage has a hysteresis of about 50 mV, to ensure spike free brown-
out detection. The typical value of the brownout detector threshold is 2.80V with an accuracy of
± 3.5% and is factory calibrated.
The brownout detector is low-power, as it consumes less than 28 A static current. However, it
can be deactivated to save its static current. In this case, it consumes less than 1A. The deac-
tivation is configured through the GPNVM bit 0 of the Flash.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AT91SAM7X256B-CU-999 | 功能描述:ARM微控制器 - MCU IND TEMP MRL B RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 處理器系列:STM32F373xx 數(shù)據(jù)總線寬度:32 bit 最大時鐘頻率:72 MHz 程序存儲器大小:256 KB 數(shù)據(jù) RAM 大小:32 KB 片上 ADC:Yes 工作電源電壓:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:LQFP-48 安裝風格:SMD/SMT |
| AT91SAM7X256C-AU | 功能描述:微處理器 - MPU LQFP GRN IND TMP MRL C 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 最大時鐘頻率:536 MHz 程序存儲器大小: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 安裝風格:SMD/SMT 封裝 / 箱體:FBGA-324 |
| AT91SAM7X256C-AUR | 功能描述:ARM微控制器 - MCU LQFP Green IND TEMP MRL B, T&R MRLC RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 處理器系列:STM32F373xx 數(shù)據(jù)總線寬度:32 bit 最大時鐘頻率:72 MHz 程序存儲器大小:256 KB 數(shù)據(jù) RAM 大小:32 KB 片上 ADC:Yes 工作電源電壓:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:LQFP-48 安裝風格:SMD/SMT |
| AT91SAM7X256C-CU | 功能描述:微處理器 - MPU TFBGA GRN IND TEMP MRL C 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 最大時鐘頻率:536 MHz 程序存儲器大小: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 安裝風格:SMD/SMT 封裝 / 箱體:FBGA-324 |
| AT91SAM7X256C-CUR | 制造商:Atmel Corporation 功能描述:BGA, GREEN, IND TEMP - Tape and Reel 制造商:Atmel Corporation 功能描述:IC MCU ARM7 256KB FLASH 100TFBGA |
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