M48T35Y-70MH6F STMicroelectronics, M48T35Y-70MH6F Datasheet - Page 13
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M48T35Y-70MH6F
Manufacturer Part Number
M48T35Y-70MH6F
Description
IC TIMEKPR NVRAM 256KB 5V 28SOIC
Manufacturer
STMicroelectronics
Series
Timekeeper®r
Type
Clock/Calendar/NVSRAMr
Datasheet
1.M48T35Y-70MH1E.pdf
(28 pages)
Specifications of M48T35Y-70MH6F
Memory Size
256K (32K x 8)
Time Format
HH:MM:SS (24 hr)
Date Format
YY-MM-DD-dd
Interface
Parallel
Voltage - Supply
4.5 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
28-SOIC, 28-SOH (8.48mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-4717-2
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
M48T35, M48T35Y
Note:
3.4
Table 5.
Keys:
When CEB is set to '1,' CB will toggle from '0' to '1' or from '1' to '0' at the turn of the century
(dependent upon the initial value set).
When CEB is set to '0,' CB will not toggle. The WRITE bit does not need to be set to write to
CEB.
Calibrating the clock
The M48T35/Y is driven by a quartz-controlled oscillator with a nominal frequency of
32,768 Hz. The devices are tested not to exceed 35 ppm (parts per million) oscillator
frequency error at 25 °C, which equates to about ±1.53 minutes per month. With the
calibration bits properly set, the accuracy of each M48T35/Y improves to better than +1/–2
ppm at 25 °C.
The oscillation rate of any crystal changes with temperature (see
Most clock chips compensate for crystal frequency and temperature shift error with
cumbersome “trim” capacitors. The M48T35/Y design, however, employs periodic counter
correction. The calibration circuit adds or subtracts counts from the oscillator divider circuit
at the divide by 256 stage, as shown in
are blanked (subtracted, negative calibration) or split (added, positive calibration) depends
upon the value loaded into the five calibration bits found in the control register. Adding
counts speeds the clock up, subtracting counts slows the clock down.
The calibration byte occupies the five lower order bits (D4-D0) in the control register 7FF8h.
These bits can be set to represent any value between 0 and 31 in binary form. Bit D5 is the
Address
7FFDh
7FFCh
7FFFh
7FFEh
7FFBh
7FFAh
7FF9h
7FF8h
S = SIGN bit
FT = FREQUENCY TEST bit (must be set to '0' upon power for normal operation)
R = READ bit
W = WRITE bit
ST = STOP bit
0 = Must be set to '0'
CEB = CENTURY ENABLE bit
CB = CENTURY bit
D7
ST
W
Register map
0
0
0
0
0
D6
FT
R
0
0
0
10 Years
10 seconds
10 minutes
CEB
D5
S
0
10 hours
10 date
Doc ID 2611 Rev 9
10 M.
CB
D4
Data
Figure 9 on page
D3
0
Calibration
D2
Seconds
Minutes
Month
Hours
Date
Year
Day
D1
15. The number of times pulses
D0
Figure 8 on page
Seconds
Century/
Minutes
Control
Month
Hours
Date
Year
day
Function/range
BCD format
Clock operations
00-01/01-07
00-99
01-12
01-31
00-23
00-59
00-59
15).
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