Telos
Rev B (Low Power Wireless Sensor Module)
Moteiv Corporation
Telos (Rev B) : PRELIMINARY Datasheet (12/5/2004)
Page 19 of 28
External Flash
Telos Revision B uses the ST M25P80 40MHz serial code flash for external data and code
storage. The flash holds 1024kB of data and is decomposed into 16 segments, each 64kB in
size. The flash shares SPI communication lines with the CC2420 transceiver. Care must be
taken when reading or writing to flash such that it is interleaved with radio communication,
typically implemented as a software arbitration protocol for the SPI bus on the microcontroller.
S
C
_
H
S
A
L
F
C
C
V
D
_
P
C
C
V
D
K
L
C
S
_
O
I
D
A
R
O
S
_
O
I
D
A
R
I
S
_
O
I
D
A
R
D
L
O
H
_
H
S
A
L
F
r
e
w
o
P
B
S
U
4
.
4
P
7
.
4
P
C
C
V
D
9
2
R
k
0
1
5
U
0
8
P
5
2
M
S
1
Q
2
W
3
s
s
V
4
D
5
C
6
D
L
O
H
7
c
c
V
8
Figure 16 : External serial flash schematic
Typical Operating Conditions
MIN NOM MAX UNIT
Supply voltage during flash memory programming
2.7
3.6
V
Operating free air temperature
-40
85
o
C
Erase/Programming cycles
100,000
cycles
Data Retention
20
years
Active current (READ)
4
mA
Active current (WRITE/ERASE)
20
mA
Standby current
8
50
µ
A
Deep Power Down current
1
10
µΑ
NOTE:
The ST M25P-series of code flash always starts in the standby state. For low
power applications, the flash must be sent a command at boot time to place it in the deep
power down mode. If using TinyOS, the flash is automatically put into deep power down
mode and must be instructed to exit deep power down mode the first time the flash is
accessed. See the ST M25P80 datasheet for more information.
http://www.st.com/stonline/books/pdf/docs/8495.pdf
