STR7 Vs ATMEL SAM7S128 and SAM7S256
16/32 bit MCUsDecember 2006
STR730F MCU Series Technical Overview
SAM7S32
SAM7S64
SAM7S128
SAM7S256
SAM7S512
SAM7A3
SAM7X128SAM7XC128
SAM7X512SAM7XC512
Low pincount
CAN EthernetCAN
Ext Bus
2048kByte
1024kByte
512kByte
256kByte
128kByte
64kByte
32kByte
FlashSize
2005
2004
SAM7X256SAM7XC256
AT91 Single Chip Flash MCU Roadmap
2006
SAM7S321
SAM7SE512
TBD
SAM7SE256 TBD
SAM7SE32
STR910
STR910
STR910
STR7
STR73xSTR75x
STR710
STR730F MCU Series Technical Overview
ATMEL AT91SAM7S128 and AT91SAM7S256 features at a glance
128K and 256K
64 pins QFP
Peripheral DMA controller
High Speed communication channels
5V tolerant I/Os
Fast startup time from cold reset
Low power consumption
STR730F MCU Series Technical Overview
What to Propose
STR7 in 64 pin package, 128KB and 256KBSTR711, STR712, STR751, STR752, STR755
Need RAM (more than 16K) ?Propose STR71x
16K RAM is enough ?Propose STR75x
See the cross ref for details
STR730F MCU Series Technical Overview
ST STRONG selling points
ST STR71x / STR75x ATMEL SAM7S128 / 256
Better low power In Low power mode, we are better
with our STOP and Standby
modes:
-STOP: 15µA
-Standby: 10µA
Extensive documentation of power
mode and MAX values
Really FAST transition with
STR750:
55µs from STOP/Standby to Flash
execution.
Low power consumption
-38 uA typ in Ultra low power
The power is poorly documented, no MAX
value
1ms to 14ms depending on quartz
Temp. / voltage
range
STR750 has -40 / +105°C options
and can work at 3.3V OR 5V
NO 5V, NO 105°c
Better Flash
endurance
20 Year Guaranteed at 85°c 10 year only, no temp specified
STR730F MCU Series Technical Overview
ST selling points
ST STR71x / STR75x ATMEL SAM7S128 / 256
Smaller
Packages and
more options
- 8x8 64 pin BGA
- 10x10 144 pin BGA
We offer 64, 100 and 144 pin
options
NO BGA
64 pin only
Easier to start
development
4 “Starter Kits” (hard+soft) and
wide tool support.
NO “starter kit” offer. Need to buy
board and software separately
Portfolio Higher footprint covered by STR9
512K, 1MB, 2MB)
CAN Feature (no similar offer
from ATMEL)
48pin, 32K and Higher memory
(512K, 1024)
Price With new price optimization ST is better than ATMEL between 64K and
256K Flash ARM7 solution.
STR730F MCU Series Technical Overview
How to counterATMEL selling points
ATMEL ST Answer
Board design: Only 20 external
components to be added around micro.
We have less:
-STR71x: 6 mandatory, 11 max
-STR75x: 9 Mandatory, 20 max
Innovative Peripheral DMA controller Our DMA in STR750 are more powerfull with burst
transfers and circular buffer management. We have less
channels but we have enough for the peripherals that
need DMA (SPI, ADC, Timers)
High Speed communication channels
Higher speed SPI 25Mb/s
Higher speed UART 25Mb/s
This is overkill: 25Mb/s UART. We have what the
customer will really use.
SPI 8MB/s (71x) 16MB/s (75x)
Uart 1MB/s (71x) 2MB/s (75x)
Integrated Power-on reset One additional reset component needed (15cts) BUT
more reliable (Actual Atmel bug is related to the reset
circuit) and more flexible.
5V tolerant IOs STR750 can operate at 5V (5V capable)