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參數(shù)資料
| 型號： | M41T315Y-65MQ6E |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Serial Access Phantom RTC Supervisor |
| 中文描述： | 串行訪問幻影時鐘監(jiān) |
| 文件頁數(shù)： | 7/24頁 |
| 文件大?。?/td> | 404K |
| 代理商： | M41T315Y-65MQ6E |
7/24
M41T315Y*, M41T315V, M41T315W
OPERATION
Figure 6., page 5
illustrates the main elements of
the device. The following paragraphs describe the
signals and functions.
Communication with the clock is established by
pattern recognition of a serial bit stream of 64 bits
which must be matched by executing 64 consecu-
tive WRITE cycles containing the proper data on
data in (D). All accesses which occur prior to rec-
ognition of the 64-bit pattern are directed to mem-
ory via the chip enable output pin (
CEO
).
After recognition is established, the next 64 READ
or WRITE Cycles either extract or update data in
the clock and
CEO
remains high during this time,
disabling the connected memory (see
Table
2., page 7
).
Data transfer to and from the timekeeping function
is accomplished with a serial bit stream under con-
trol of chip enable input (
CEI
), output enable (
OE
),
and WRITE enable (
WE
). Initially, a READ cycle
using the
CEI
and
OE
control of the clock starts the
pattern recognition sequence by moving the point-
er to the first bit of the 64-bit comparison register.
Next, 64 consecutive WRITE cycles are executed
using the
CEI
and
WE
control of the clock. These
64 WRITE cycles are used only to gain access to
the clock.
When the first WRITE cycle is executed, it is com-
pared to the first bit of the 64-bit comparison reg-
ister. If a match is found, the pointer increments to
the next location of the comparison register and
awaits the next WRITE cycle.
If a match is not found, the pointer does not ad-
vance and all subsequent WRITE cycles are ig-
nored. If a READ cycle occurs at any time during
pattern recognition, the present sequence is abort-
ed and the comparison register pointer is reset.
Pattern recognition continues for a total of 64
WRITE cycles as described above until all the bits
in the comparison register have been matched
(see
Figure 10., page 11
.)
With a correct match for 64 bits, access to the reg-
isters is enabled and data transfer to or from the
timekeeping registers may proceed. The next 64
cycles will cause the device to either receive data
on D, or transmit data on Q, depending on the lev-
el of
OE
pin or the
WE
pin. Cycles to other locations
outside the memory block can be interleaved with
CEI
cycles without interrupting the pattern recogni-
tion sequence or data transfer sequence to the de-
vice.
For a SO16 pin package, a standard 32.768 kHz
quartz crystal can be directly connected to the
M41T315Y/V/W via pins 1 and 2 (XI, XO). The
crystal selected for use should have a specified
load capacitance (C
L
) of 12.5 pF (see
Table
10., page 17
).
Table 2. Operating Modes
Note: X = V
IH
or V
IL
; V
SO
= Battery Back-up Switchover Voltage.
Note: 1. See
Table 11., page 17
for details.
Mode
V
CC
CEI
OE
WE
D
Q
Power
Deselect
4.5 to 5.5V
or
3.0 to 3.6V
or
2.7 to 3.3V
V
IH
X
X
Hi-Z
Hi-Z
Standby
WRITE
V
IL
X
V
IL
D
IN
Hi-Z
Active
READ
V
IL
V
IL
V
IH
Hi-Z
D
OUT
Active
READ
V
IL
V
IH
V
IH
Hi-Z
Hi-Z
Active
Deselect
V
SO
to V
PFD
(min)
(1)
X
X
X
Hi-Z
Hi-Z
CMOS Standby
Deselect
≤
V
SO(1)
X
X
X
Hi-Z
Hi-Z
Battery Back-up Mode
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| M41T315Y-65MQ6F | Serial Access Phantom RTC Supervisor |
| M41T315Y-65MQ6TR | Serial Access Phantom RTC Supervisor |
| M41T315Y-85MH6E | Serial Access Phantom RTC Supervisor |
| M41T315Y-85MH6F | Serial Access Phantom RTC Supervisor |
| M41T315Y-85MH6TR | Serial Access Phantom RTC Supervisor |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M41T315Y-65MQ6F | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial Access Phantom RTC Supervisor |
| M41T315Y-65MQ6TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial Access Phantom RTC Supervisor |
| M41T315Y-85MH6E | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial Access Phantom RTC Supervisor |
| M41T315Y-85MH6F | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial access phantom RTC supervisor |
| M41T315Y-85MH6TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial Access Phantom RTC Supervisor |
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