Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

M41T315W-85MH6TR Datasheet(PDF) 7 Page - STMicroelectronics

Part # M41T315W-85MH6TR
Description  Serial Access Phantom RTC Supervisor
Download  24 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M41T315W-85MH6TR Datasheet(HTML) 7 Page - STMicroelectronics

Back Button M41T315W-85MH6TR Datasheet HTML 3Page - STMicroelectronics M41T315W-85MH6TR Datasheet HTML 4Page - STMicroelectronics M41T315W-85MH6TR Datasheet HTML 5Page - STMicroelectronics M41T315W-85MH6TR Datasheet HTML 6Page - STMicroelectronics M41T315W-85MH6TR Datasheet HTML 7Page - STMicroelectronics M41T315W-85MH6TR Datasheet HTML 8Page - STMicroelectronics M41T315W-85MH6TR Datasheet HTML 9Page - STMicroelectronics M41T315W-85MH6TR Datasheet HTML 10Page - STMicroelectronics M41T315W-85MH6TR Datasheet HTML 11Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 7 / 24 page
background image
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 (CL) of 12.5 pF (see Table
10., page 17).
Table 2. Operating Modes
Note: X = VIH or VIL; VSO = Battery Back-up Switchover Voltage.
Note: 1. See Table 11., page 17 for details.
Mode
VCC
CEI
OE
WE
D
QPower
Deselect
4.5 to 5.5V
or
3.0 to 3.6V
or
2.7 to 3.3V
VIH
X
X
Hi-Z
Hi-Z
Standby
WRITE
VIL
X
VIL
DIN
Hi-Z
Active
READ
VIL
VIL
VIH
Hi-Z
DOUT
Active
READ
VIL
VIH
VIH
Hi-Z
Hi-Z
Active
Deselect
VSO to VPFD (min)
(1)
X
X
X
Hi-Z
Hi-Z
CMOS Standby
Deselect
≤ VSO(1)
X
X
X
Hi-Z
Hi-Z
Battery Back-up Mode


Similar Part No. - M41T315W-85MH6TR

ManufacturerPart #DatasheetDescription
logo
STMicroelectronics
M41T315W-85MH6TR STMICROELECTRONICS-M41T315W-85MH6TR Datasheet
241Kb / 30P
   Serial access phantom RTC supervisor
More results

Similar Description - M41T315W-85MH6TR

ManufacturerPart #DatasheetDescription
logo
STMicroelectronics
M41T315Y STMICROELECTRONICS-M41T315Y_07 Datasheet
241Kb / 30P
   Serial access phantom RTC supervisor
M41T80 STMICROELECTRONICS-M41T80 Datasheet
122Kb / 20P
   SERIAL ACCESS RTC WITH ALARMS
M41ST85W STMICROELECTRONICS-M41ST85W_07 Datasheet
369Kb / 41P
   3.0/3.3V I2C combination serial RTC, NVRAM supervisor and microprocessor supervisor
M41ST85W STMICROELECTRONICS-M41ST85W_06 Datasheet
606Kb / 34P
   3.0/3.3V I2C Combination Serial RTC, NVRAM Supervisor and Microprocessor Supervisor
M41T81S STMICROELECTRONICS-M41T81S_12 Datasheet
507Kb / 32P
   Serial access real-time clock (RTC) with alarms
M41ST85W STMICROELECTRONICS-M41ST85W_11 Datasheet
450Kb / 43P
   3.0/3.3 V I2C combination serial RTC, NVRAM supervisor and microprocessor supervisor
logo
Texas Instruments
BQ4847 TI-BQ4847_07 Datasheet
247Kb / 6P
[Old version datasheet]   RTC Module With CPU Supervisor
BQ4847 TI-BQ4847 Datasheet
224Kb / 5P
[Old version datasheet]   RTC Module With CPU Supervisor
BQ4845 TI-BQ4845 Datasheet
1Mb / 22P
[Old version datasheet]   Parallel RTC With CPU Supervisor
BQ4845 TI1-BQ4845_14 Datasheet
1Mb / 24P
[Old version datasheet]   Parallel RTC With CPU Supervisor
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.NET
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com