Description
M95640-W M95640-R M95640-DF
1
Description
The M95640 devices are Electrically Erasable PROgrammable Memories (EEPROMs)
organized as 8192 x 8 bits, accessed through the SPI bus.
The M95640-W can operate with a supply voltage from 2.5 V to 5.5 V, the M95640-R can
operate with a supply voltage from 1.8 V to 5.5 V, and the M95640-DF can operate with a
supply voltage from 1.7 V to 5.5 V, over an ambient temperature range of -40 °C / +85 °C.
The M95640-D offers an additional page, named the Identification Page (32 bytes). The
Identification Page can be used to store sensitive application parameters which can be
(later) permanently locked in Read-only mode.
Figure 1.
Logic diagram
V
CC
D
C
S
Q
M95xxx
W
HOLD
V
SS
AI01789C
The SPI bus signals are C, D and Q, as shown in Figure 1 and Table 1. The device is
selected when Chip Select (S) is driven low. Communications with the device can be
interrupted when the HOLD is driven low.
Table 1.
Signal names
Signal name
Function
Direction
C
Serial Clock
Input
Input
Output
Input
Input
Input
D
Serial Data Input
Serial Data Output
Chip Select
Write Protect
Hold
Q
S
W
HOLD
VCC
VSS
Supply voltage
Ground
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Doc ID 16877 Rev 16
STMICROELECTRONICS [ ST ]
