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| Part Number | AT91SAM7S321-AU | AT91SAM7S321-MU | AT91SAM7S32B-AU |
|---|---|---|---|
| Manufacturer | Microchip Technology | Atmel | Microchip Technology |
| Product Status | Obsolete | Obsolete | Obsolete |
| Core Processor | ARM7® | ARM7® | ARM7® |
| Core Size | 16/32-Bit | 16/32-Bit | 16/32-Bit |
| Speed | 55MHz | 55MHz | 55MHz |
| Connectivity | I²C, SPI, SSC, UART/USART, USB | I²C, SPI, SSC, UART/USART, USB | I²C, SPI, SSC, UART/USART |
| Peripherals | Brown-out Detect/Reset, DMA, POR, PWM, WDT | Brown-out Detect/Reset, DMA, POR, PWM, WDT | Brown-out Detect/Reset, DMA, POR, PWM, WDT |
| Number of I/O | 32 | 32 | 21 |
| Program Memory Size | 32KB (32K x 8) | 32KB (32K x 8) | 32KB (32K x 8) |
| Program Memory Type | Flash | Flash | Flash |
| EEPROM Size | - | - | - |
| RAM Size | 8K x 8 | 8K x 8 | 8K x 8 |
| Voltage - Supply (Vcc/Vdd) | 1.65V ~ 1.95V | 1.65V ~ 1.95V | 1.65V ~ 1.95V |
| Data Converters | A/D 8x10b | A/D 8x10b | A/D 8x10b |
| Oscillator Type | Internal | Internal | Internal |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount |
| Package / Case | 64-LQFP | 64-VFQFN Exposed Pad | 48-LQFP |
| Supplier Device Package | 64-LQFP (10x10) | 64-QFN (9x9) | 48-LQFP (7x7) |
