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PDF DS1216 Data sheet ( Hoja de datos )
| Número de pieza | DS1216 | |
| Descripción | SmartWatch RAM DS1216B/C/D/H SmartWatch ROM DS1216E/F | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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DS1216
SmartWatch RAM DS1216B/C/D/H
SmartWatch ROM DS1216E/F
FEATURES
§ Keeps track of hundredths of seconds,
seconds, minutes, hours, days, date of the
month, months, and years
§ Converts standard 2k x 8 up to 512k x 8
CMOS static RAMs into nonvolatile memory
§ Embedded lithium energy cell maintains
watch information and retains RAM data
§ Watch function is transparent to RAM
operation
§ Month and year determine the number of days
in each month; leap-year compensation valid
up to 2100
§ Lithium energy source is electrically
disconnected to retain freshness until power is
applied for the first time
§ Proven gas-tight socket contacts
§ Full ±10% operating range
§ Operating temperature range: 0°C to +70°C
§ Accuracy is better than ±1 minute/month @
+25°C
ORDERING INFORMATION
DS1216B, DS1216C, DS1216D, DS1216E,
DS1216F, DS1216H (See Figure 2 for letter suffix
marking identification.)
PIN DESCRIPTION
RST
DQ0
A2
A0
GND
- RESET
- Data Input/Output 0 [RAM]
- Address Bit 2 (Read/Write [ROM])
- Address Bit 0 (Data Input [ROM])
- Ground
CE - Conditioned Chip Enable
OE - Output Enable
WE
Vcc
VCCB
VCCD
- Write Enable
- Switched VCC for 28-/32-Pin RAM
- Switched VCC for 24-Pin RAM
- Switched VCC for 28-Ppin RAM
PART
DS1216B
DS1216C
DS1216D
DS1216E
DS1216F
DS1216H
RAM/ROM
RAM
RAM
RAM
ROM
ROM
RAM
RAM DENSITY
16k/64k
64k/256k
256k/1M
64k/256k
64k/256k/1M
1M/4M
1 of 13
RST 1
2
3
4
5
6
7
[A2] 8
9
[A0] 10
DQ0 11
12
13
GND 14
28 VCC
27 WE
26 VCCB
25
24
23
22 OE
21
20 CE
19
18
17
16
15
DS1216B/C/D/E
28-Pin Intelligent Socket
PCB MODIFICATION REQUIRED
FOR DENSITY UPGRADE?
No/Yes
No
No/Yes
No
No
No
111901
1 page  
DS1216
SMARTWATCH REGISTER INFORMATION
The SmartWatch information is contained in eight registers of 8 bits, each of which is sequentially
accessed one bit at a time after the 64-bit pattern recognition sequence has been completed. When
updating the SmartWatch registers, each must be handled in groups of 8 bits. Writing and reading
individual bits within a register could produce erroneous results. These read/write registers are defined in
Figure 3.
Data contained in the SmartWatch registers is in binary-coded decimal format (BCD). Reading and
writing the registers is always accomplished by stepping through all eight registers, starting with bit 0 of
register 0 and ending with bit 7 of register 7.
AM–PM/12/24 MODE
Bit 7 of the hours register is defined as the 12-hour or 24-hour mode-select bit. When high, the 12-hour
mode is selected. In the 12-hour mode, bit 5 is the AM/PM bit with logic high being PM. In the 24-hour
mode, bit 5 is the second 10-hour bit (20–23 hours).
OSCILLATOR AND RESET BITS
Bits 4 and 5 of the day register are used to control the RESET and oscillator functions. Bit 4 controls the
RESET (pin 1). When the RESET bit is set to logic 1, the RESET input pin is ignored. When the RESET bit
is set to logic 0, a low input on the RESET pin will cause the SmartWatch to abort data transfer without
changing data in the watch registers. Bit 5 controls the oscillator. When set to logic 1, the oscillator is off.
When set to logic 0, the oscillator turns on and the watch becomes operational. These bits are shipped
from the factory set to logic 1.
ZERO BITS
Registers 1, 2, 3, 4, 5, and 6 contain one or more bits that will always read logic 0. When writing these
locations, either a logic 1 or 0 is acceptable.
ADDITIONAL INFORMATION
Refer to Application Note 52 for information about using regarding optional modifications and the
phantom clock contained within the SmartWatch.
5 of 13
5 Page 
TIMING DIAGRAM: POWER-DOWN
DS1216
TIMING DIAGRAM: POWER-UP
Warning: Under no circumstances should negative undershoots of any amplitude be allowed when the
device is in battery-backup mode. Water washing for flux removal will discharge internal lithium source
because exposed voltage pins are present.
11 of 13
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet DS1216.PDF ] | |
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