AT91SAM7S32B-MU Atmel, AT91SAM7S32B-MU Datasheet - Page 730

• Manufacturer Part Number: AT91SAM7S32B-MU
• Description: IC MCU ARM7 32KB FLASH 48-VQFN
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91SAM7S32B-MU

• Core Processor: ARM7
• Core Size: 16/32-Bit
• Speed: 55MHz
• Connectivity: I²C, SPI, SSC, UART/USART
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 21
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-VQFN Exposed Pad, 48-HVQFN, 48-SQFN, 48-DHVQFN
• For Use With: AT91SAM-ICE - EMULATOR FOR AT91 ARM7/ARM9AT91SAM7S-EK - KIT EVAL FOR ARM AT91SAM7S
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

40.20.2
40.20.2.1
40.20.3
40.20.3.1
40.20.3.2
40.20.3.3
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AT91SAM7S Series Preliminary
Non Volatile Memory Bits (NVM Bits)
Parallel Input/Output Controller (PIO)
NVM Bits: Write/Erase Cycles Number
PIO: Leakage on PA17 - PA20
PIO: Electrical Characteristics on NRST and PA0-PA16 and PA21-31
PIO: Drive Low NRST, PA0-PA16 and PA21-PA31
The maximum number of write/erase cycles for Non Volatile Memory bits is 100. This includes
Lock Bits (LOCKx), General Purpose NVM bits (GPNVMx) and the Security Bit.
This maximum number of write/erase cycles is not applicable to 64 KB Flash memory, it remains
at10K for the Flash memory.
None.
When PA17, PA18, PA19 or PA20 (the I/O lines multiplexed with the analog inputs) are set as
digital inputs with pull-up disabled, the leakage can be 9 µA in worst case and 90 nA in typical
case per I/O when the I/O is set externally at low level.
Set the I/O to VDDIO by internal or external pull-up.
When NRST or PA0-PA16 or PA21-PA31 are set as digital inputs with pull-up enabled, the volt-
age of the I/O stabilizes at VPull-up.
Vpull-up
This condition causes a leakage through VDDIO. This leakage is 45 µA per pad in worst case at
3.3 V and 25 µA at 1.8V.
I Leakage
It is recommended to use an external pull-up if needed.
When NRST or PA0-PA16 and or PA21-PA31 are set as digital inputs with pull-up enabled, driv-
ing the I/O with an output impedance higher than 500 ohms may not drive the I/O to a logical
zero.
Output impedance must be lower than 500 ohms.
VPull-up Min
VDDIO - 0.65 V
Parameter
I Leakage at 3,3V
I Leakage at 1.8V
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
VPull-up Max
VDDIO - 0.45 V
Typ
2.5
1
µA
µA
Max
45
25
µA
µA
6175K–ATARM–30-Aug-10