str7 vs atmel sam7s128 and sam7s256 16/32 bit mcus december 2006

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


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


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


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


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.


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)

str7 vs atmel sam7s128 and sam7s256 16/32 bit mcus december 2006

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