DS1855E-050 Maxim Integrated Products, DS1855E-050 Datasheet
DS1855E-050
Specifications of DS1855E-050
Related parts for DS1855E-050
DS1855E-050 Summary of contents
Page 1
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) ...
Page 2
PIN DESCRIPTIONS Name TSSOP BGA GND 7 D1 SDA 1 B2 SCL ...
Page 3
DS1855 BLOCK DIAGRAM Figure 2-WIRE INTERFACE GND SDA SCL eight DS1855s can be installed on a single 2-wire bus. Access to an individual device is achieved by using a device address ...
Page 4
MEMORY ORGANIZATION The DS1855’s serial EEPROM is internally organized with 256 words of 1 byte each. Each word requires an 8-bit address for random word addressing. The byte at address F9h determines the wiper setting for potentiometer 0, which contains ...
Page 5
FBh – FCh Lock Bytes FD – FFh Reserved 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 ...
Page 6
OPERATION Clock and Data Transitions The SDA pin is normally pulled high with an external resistor or device. Data on the SDA pin may only change during SCL low time periods. Data changes during SCL high periods will indicate ...
Page 7
The DS1855 is capable of an 8-byte page write. A page write is initiated the same way as a byte write, but the master does not send a STOP condition after the first byte. Instead, after the slave acknowledges receipt ...
Page 8
SERIAL PORT OPERATION The 2-wire serial port interface supports a bidirectional data transmission protocol with device addressing. A device that sends data on the bus is defined as a transmitter, and a device receiving data is defined as a ...
Page 9
Data transfer from a master transmitter to a slave receiver. The first byte transmitted by the master is the command/control byte. Next, follows a number of data bytes. The slave returns an acknowledge bit after each received byte. 2. ...
Page 10
LOCKING AND UNLOCKING EEPROM In addition to the WP pin possible to write-protect, or lock, certain portions of the EEPROM through software control. The DS1855 256-byte EEPROM can be visualized as three blocks, or partitions. The lower block ...
Page 11
PROTOCOL DATA TRANSFER PROTOCOL Figure 2 2-WIRE AC CHARACTERISTICS Figure ...
Page 12
ABSOLUTE MAXIMUM RATINGS* Voltage on Any Pin Relative to Ground Operating Temperature Range Programming Temperature Range Storage Temperature Range Soldering Temperature * This is a stress rating only and functional operation of the device at these or any other conditions ...
Page 13
ANALOG RESISTOR CHARACTERISTICS (-40°C to +85°C; V PARAMETER SYMBOL Resistor Inputs Wiper Resistance R Wiper Current End-to-End Resistance Absolute Linearity Relative Linearity -3dB Cutoff f cutoff Frequency End-to-End Temp. Coefficient CONDITION GND - 3.0V W 5.0V I ...
Page 14
AC ELECTRICAL CHARACTERISTICS PARAMETER SYMBOL SCL Clock Frequency Bus Free Time Between STOP and START Hold Time (repeated) START Condition Low Period of SCL Clock High Period of SCL Clock Data Hold Time Data Set-Up Time Start Set-Up Time Rise ...
Page 15
NOTES: 1. All voltages are referenced to ground specified with for V STBY logic levels. Appropriate logic levels specify that logic inputs are within a 0.5V of ground or V the corresponding inactive state. 3. I/O pins of ...
Page 16
TYPICAL OPERATING CHARACTERISTICS ( +25ºC, unless otherwise specified WIPER RESISTANCE vs. WIPER VOLTAGE 450 400 350 300 250 200 150 100 50 POT 0, ...
Page 17
TYPICAL OPERATING CHARACTERISTICS (cont 5V +25ºC, unless otherwise specified) CC END-TO-END RES % CHANGE vs. TEMPERATURE 2.5% 2.0% 1.5% 1.0% 0.5% 0.0% -0.5% -1.0% -1.5% -2.0% -40 - -10 -15 - ...
Page 18
TYPICAL OPERATING CHARACTERISTICS (cont 5V +25ºC, unless otherwise specified) CC 150 130 110 RESISTANCE vs. VOLTAGE (POWER-UP) 160,000 140,000 120,000 100,000 80,000 60,000 40,000 20,000 0 0.0 0.5 ACTIVE ...
Page 19
TYPICAL OPERATING CHARACTERISTICS (cont 5V +25ºC, unless otherwise specified) CC RESISTANCE vs. VOLTAGE (POWER-DOWN) 70,000 60,000 Pot 1 set to 255 decimal 50,000 40,000 Pot 1 set to 127 decimal 30,000 20,000 Pot 0 set to ...
Page 20
... DS1855E-010+ 16-BALL CSBGA LEAD FREE 16-BALL CSBGA LEAD FREE DS1855E-010+T&R TAPE & REEL DS1855E-050+ 16-BALL CSBGA LEAD FREE 16-BALL CSBGA LEAD FREE DS1855E-050+T&R TAPE & REEL PACKAGE TEMPERATURE -40ºC TO +85ºC -40ºC TO +85ºC -40ºC TO +85ºC -40ºC TO +85ºC -40ºC TO +85ºC -40º ...