84:
31:
150:
to 8 MB, while SPI EEPROM capacities in similar packages range from 1 kB to 8 MB . Flash chips are tuned for page access, rather than the byte access used with EEPROM. However, AT45 series chips have commands that let their drivers act more like EEPROM drivers. Leveraging the SRAM buffers exposed by
122:
The AT26 series DataFlash chips are software-incompatible with the original AT45 series chips. They use a simpler command set, supported by other vendors of serial flash but omitting SRAM buffers and other features that make AT45 chips simpler to support.
161:
In summary, DataFlash enables use of more data storage and faster access times than EEPROM. DataFlash chips can leverage the AT45 SRAM buffers. EEPROMs, AT26 series chips, or MMC/SD cards permit use of second sources for parts.
261:
146:
DataFlash usually had higher capacities than EEPROM in the early days, and it still provides faster access times. DataFlash capacities in small packages range from 128
158:
or SD cards, and have lower capacities, but have an extremely simple programming interface compared to MMC/SD. All these cards can be used in SPI mode.
165:
For cards used in field upgrades, DataFlash cards permit simple software support and compatibility with on-board flash chips; MMC/SD costs less.
83:
61:. In October 2012, the AT45 series DataFlash product lines, related intellectual property, and supporting employee teams were purchased by
269:
112:
8-pin package. This chip is used in a huge number of consumer electronic products. Any microcontroller can use this chip to store data.
231:
109:
136:
58:
119:
or SD card. This DataFlash card packages an AT45DB642D flash chip, which is also available in 8x6 mm CASON 8-pin packages.
30:
348:
139:(SPI bus). Both are available in small 8 pin packages. The protocol interfaces are very similar; in both cases,
80:. The boot ROM of numerous Atmel ARM microcontrollers support downloading code from DataFlash chips after reset.
177:
73:
62:
97:
68:
Information is written and read from a DataFlash device using any microcontroller, such as the
115:
The AT45DCB008D card is an 8 MB (64 Mbit) flash memory card, which could be mistaken for an
77:
46:
239:
155:
116:
342:
291:
206:
151:
AT45 chips to do more than support EEPROM-like access requires specialized software.
316:
168:
The programming code required to interface EEPROM to the DataFlash chip is simpler.
50:
232:"Atmel Completes Sale of Serial Flash Product Families to Adesto Technologies"
69:
147:
101:
105:
181:
132:
17:
82:
54:
35:
29:
185:
140:
154:
DataFlash cards are more expensive than the consumer oriented
135:
chips can be accessed from a microcontroller, using a 4-wire
143:
are written or read, via SPI, one or more bytes at a time.
317:"Developing Atmel AT45DB DataFlash device driver for eCos"
180:are available for operating systems such as
8:
108:) dataflash product. This comes in a 8x5 mm
57:proprietary interface, compatible with the
207:"Adesto buys Atmel serial flash families"
238:. Atmel. October 1, 2012. Archived from
197:
87:Atmel AT45DB642D-CNU with CASON package
7:
25:
205:Peter Clarke (October 1, 2012).
110:small outline integrated circuit
176:Examples of source code in the
137:Serial Peripheral Interface Bus
1:
100:(chip) is an example of a 2
365:
53:. It was developed as an
268:. Atmel. Archived from
178:C programming language
88:
39:
86:
33:
296:BeRTOS Documentation
349:Non-volatile memory
266:Former product page
131:Both DataFlash and
63:Adesto Technologies
45:is a low pin-count
272:on August 26, 2011
98:Integrated circuit
89:
40:
242:on March 17, 2013
16:(Redirected from
356:
333:
332:
330:
328:
321:Application Note
313:
307:
306:
304:
302:
288:
282:
281:
279:
277:
258:
252:
251:
249:
247:
228:
222:
221:
219:
217:
202:
47:serial interface
21:
364:
363:
359:
358:
357:
355:
354:
353:
339:
338:
337:
336:
326:
324:
315:
314:
310:
300:
298:
290:
289:
285:
275:
273:
260:
259:
255:
245:
243:
230:
229:
225:
215:
213:
204:
203:
199:
194:
174:
129:
96:The AT45DB161D
94:
28:
23:
22:
15:
12:
11:
5:
362:
360:
352:
351:
341:
340:
335:
334:
308:
283:
253:
223:
196:
195:
193:
190:
173:
170:
128:
125:
93:
90:
26:
24:
14:
13:
10:
9:
6:
4:
3:
2:
361:
350:
347:
346:
344:
327:September 27,
322:
318:
312:
309:
301:September 27,
297:
293:
292:"dataflash.c"
287:
284:
276:September 27,
271:
267:
263:
257:
254:
246:September 27,
241:
237:
236:Press release
233:
227:
224:
216:September 27,
212:
208:
201:
198:
191:
189:
187:
183:
179:
171:
169:
166:
163:
159:
157:
152:
149:
144:
142:
138:
134:
126:
124:
120:
118:
113:
111:
107:
103:
99:
91:
85:
81:
79:
75:
74:Microchip PIC
71:
66:
64:
60:
56:
52:
48:
44:
37:
32:
19:
325:. Retrieved
320:
311:
299:. Retrieved
295:
286:
274:. Retrieved
270:the original
265:
256:
244:. Retrieved
240:the original
235:
226:
214:. Retrieved
210:
200:
175:
167:
164:
160:
153:
145:
130:
121:
114:
95:
67:
59:SPI standard
51:flash memory
42:
41:
27:Flash memory
262:"DataFlash"
172:Programming
127:Comparisons
34:DataFlash:
192:References
323:. Ronetix
70:Atmel AVR
43:DataFlash
343:Category
211:EE Times
92:Examples
38:25DF041A
76:or the
184:, and
182:BeRTOS
133:EEPROM
72:, the
141:bytes
55:Atmel
36:Atmel
329:2013
303:2013
278:2013
248:2013
218:2013
186:eCos
106:Mbit
104:(16
49:for
18:AT45
156:MMC
117:MMC
78:ARM
345::
319:.
294:.
264:.
234:.
209:.
188:.
148:kB
102:MB
65:.
331:.
305:.
280:.
250:.
220:.
20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
