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PDF DS1855B-020 Data sheet ( Hoja de datos )
| Número de pieza | DS1855B-020 | |
| Descripción | Dual Nonvolatile Digital Potentiometer and Secure Memory | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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DS1855
Dual Nonvolatile Digital Potentiometer
and Secure Memory
FEATURES
§ Two linear taper potentiometers
- DS1855-010 (one 10k, 100 position and
one 10k, 256 position)
- DS1855-020 (one 10k, 100 position and
one 20k, 256 position)
- DS1855-050 (one 10k, 100 position and
one 50k, 256 position)
- DS1855-100 (one 10k, 100 position and
one 100k, 256 position)
§ 256 bytes of EEPROM memory
§ Access to data and potentiometer control via
a 2-wire interface
§ External write-protect pin to protect data and
potentiometer settings
§ Data and potentiometer settings also can be
write-protected through software control
§ Nonvolatile wiper storage
§ Operates from 3V or 5V supplies
§ Packaging: 14-pin TSSOP, 16-ball STPBGA,
flip-chip package
§ Industrial operating temperature:
-40ºC to +85ºC
§ Programming temperature: 0ºC to +85ºC
SDA
SCL
A0
A1
A2
WP
GND
1
2
3
4
5
6
7
14 Vcc
13 H0
12 W1
11 H1
10 L1
9 W0
8 L0
14-Pin TSSOP (173-mil)
Top View
A
B
C
D
1234
16-Ball STPBGA (4mm x 4mm)
14-Pin Flip Chip (100-mil x 100-mil)
(Not Shown)
DESCRIPTION
The DS1855 dual nonvolatile (NV) digital potentiometer and secure memory consists of one 100-position
linear taper potentiometer, one 256-position linear taper potentiometer, 256 bytes of EEPROM memory,
and a 2-wire interface. The DS1855, which features a new software write protect, is an upgrade of the
DS1845. The DS1855 provides an ideal method for setting bias voltages and currents in control
applications using a minimum of circuitry. The EEPROM memory allows a user to store configuration or
calibration data for a specific system or device as well as provide control of the potentiometer wiper
settings. Any type of user information may reside in the first 248 bytes of this memory. The next two
addresses of EEPROM memory are for potentiometer settings and the remaining 6 bytes of memory are
reserved. These reserved and potentiometer registers should not be used for data storage. Access to this
EEPROM is via an industry-standard 2-wire bus. The interface I/O pins consist of SDA and SCL. The
wiper position of the DS1855, as well as EEPROM data, can be write-protected through hardware using
the write-protect input pin (WP) or software using the 2-wire interface.
1 of 20
100101
1 page  
FBh – FCh Lock Bytes
FD – FFh
Reserved
DS1855
Writing to these two bytes allows the user to lock or unlock the
memory described in byte FAh.
LOCK: If memory location FBh is written to 56h and memory
location FCh is written to 25h, the device will enter lock mode.
Write protection will become active in the memory locations that
are specified in FAh.
UNLOCK: If memory location FBh is written to 67h and memory
location FCh is written to 36h, the device will be unlocked. Once
unlocked, the user can change the setting of memory location FAh
to affect the EEPROM write-protection.
The locking can be updated at any time as long as the upper
page is unlocked.
Reserved
5 of 20
5 Page 
2-WIRE PROTOCOL DATA TRANSFER PROTOCOL Figure 2
DS1855
2-WIRE AC CHARACTERISTICS Figure 3
11 of 20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet DS1855B-020.PDF ] | |
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