DataSheet.es    


PDF DS1847 Data sheet ( Hoja de datos )

Número de pieza DS1847
Descripción Dual Temperature-Controlled NV Variable Resistor
Fabricantes Dallas Semiconductor 
Logotipo Dallas Semiconductor Logotipo



Hay una vista previa y un enlace de descarga de DS1847 (archivo pdf) en la parte inferior de esta página.


Total 17 Páginas

No Preview Available ! DS1847 Hoja de datos, Descripción, Manual

www.DataSheet4U.com
www.maxim-ic.com
FEATURES
§ Two linear taper, temperature-controlled
variable resistors
§ DS1847-050
- One 50kW, 256 position
- One 10kW, 256 position
§ DS1847-010
- Two 10kW, 256 position
§ Resistor settings changeable every 2°C
§ Access to temperature data and device
control via a 2-wire interface
§ Operates from 3V or 5V supplies
§ Packaging: 14-pin TSSOP, 16-ball CSBGA
§ Operating temperature: -40ºC to +95ºC
§ Programming temperature: 0ºC to +70ºC
DS1847
Dual Temperature-Controlled
NV Variable Resistor
PIN ASSIGNMENT
SDA
SCL
A0
A1
A2
WP
GND
1
2
3
4
5
6
7
14 Vcc
13 H0
12 NC
11 H1
10 L1
9 NC
8 L0
14-Pin TSSOP (173-mil)
Top View
A
B
C
D
1234
16-Ball CSBGA (4mm x 4mm)
DESCRIPTION
The DS1847 Dual Temperature-Controlled Nonvolatile (NV) Variable Resistor consists of two 256-
position linear, variable resistors. The DS1847-050 consists of one 10kW and one 50kW, while the
DS1847-010 consists of two 10kW resistors; both incorporate a direct-to-digital temperature sensor. The
device provides an ideal method for setting and temperature-compensating bias voltages and currents in
control applications using a minimum of circuitry.
The variable resistors settings are stored in EEPROM memory and can be accessed over the industry
standard 2-wire serial bus. The value of each variable resistor is determined by a temperature-addressed
look-up table, which can assign a unique value to each resistor for every 2°C increment over the -40°C to
+95°C range. The output of the digital temperature sensor is also available as a 13-bit, 2’s complement
value over the serial bus. The interface I/O pins consist of SDA and SCL.
1 of 17
081502

1 page




DS1847 pdf
Memory
Name of Location
Location
E2whww.DataSheet4U.com Temperature MSB
E3h Temperature LSB
E4h Address Pointer
E5h to E6h
E7h
User Memory
Address Select
E8h to EFh
F0h
F1h
F2h to FFh
User Memory
Resistor 0 Setting
Resistor 1 Setting
User memory
Function of Location
DS1847
This byte contains the MSB of the 13-bit 2s
complement temperature output from the
temperature sensor.
S 27 26 25 24 23 22 21
This byte contains the LSB of the 13-bit 2s
complement temperature output from the
temperature sensor.
20 2-1 2-2 2-3 2-4 X X X
For example temperature readings, refer to Table
2.
Calculated, current resistor address (0h – 47h).
The user-defined resistor setting at this location in
the respective look-up table will be loaded into
F0h and F1h to set the two resistors.
General purpose user memory (SRAM)
Internal or external device address select. This
byte allows the user to use the external address
pins or an internal register location to determine
the device address.
A2 A1 A0 ENB
ENB = 0 and external A2, A1, A0 grounded,
device will use internal address bits (A2, A1, A0)
in this register
ENB = 1, external A2, A1, A0 = any setting,
device will use external address pins
Default setting is 01h. The device uses external
pins to determine its address.
General purpose user memory (SRAM)
In the user-controlled setting mode, this block
contains the resistor 0 setting.
In the user-controlled setting mode, this block
contains the resistor 1 setting.
General purpose user memory (SRAM)
5 of 17

5 Page





DS1847 arduino
DS1847
slave by not generating an acknowledge bit on the last byte that has been clocked out of the slave. In this
case, the slave must leave the data line HIGH to enable the master to generate the STOP condition.
1. wDwwa.tDaattarSahnesefte4Ur .fcroomm 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. Data transfer from a slave transmitter to a master receiver. The master transmits the first byte (the
command/control byte) to the slave. The slave then returns an acknowledge bit. Next, follows a
number of data bytes transmitted by the slave to the master. The master returns an acknowledge bit
after all received bytes other than the last byte. At the end of the last received byte, a ‘not
acknowledge’ can be returned.
The master device generates all serial clock pulses and the START and STOP conditions. A transfer is
ended with a STOP condition or with a repeated START condition. Since a repeated START condition is
also the beginning of the next serial transfer, the bus will not be released.
The DS1847 may operate in the following two modes:
1. Slave receiver mode: Serial data and clock are received through SDA and SCL, respectively. After
each byte is received, an acknowledge bit is transmitted. START and STOP conditions are recognized
as the beginning and end of a serial transfer. Address recognition is performed by hardware after
reception of the slave (device) address and direction bit.
2. Slave transmitter mode: The first byte is received and handled as in the slave receiver mode.
However, in this mode the direction bit will indicate that the transfer direction is reversed. Serial data
is transmitted on SDA by the DS1847, while the serial clock is input on SCL. START and STOP
conditions are recognized as the beginning and end of a serial transfer.
3. Slave Address: Command/control byte is the first byte received following the START condition from
the master device. The command/control byte consists of a 4-bit control code. For the DS1847, this is
set as 1010 binary for read/write operations. The next 3 bits of the command/ control byte are the
device select bits or slave address (A2, A1, A0). They are used by the master device to select which
of eight devices is to be accessed. When reading or writing the DS1847, the device-select bits must
match the device-select pins (A2, A1, A0). The last bit of the command/control byte (R/W) defines
the operation to be performed. When set to a 1, a read operation is selected, and when set to a 0, a
write operation is selected.
Following the START condition, the DS1847 monitors the SDA bus checking the device type identifier
being transmitted. Upon receiving the 1010 control code, the appropriate device address bits, and the
read/write bit, the slave device outputs an acknowledge signal on the SDA line.
WRITE PROTECT
The write-protect input pin (WP) protects all memory (including EEPROM), control registers, and look-
up tables from alteration in an application. However, this does not interfere with internal
temperature/resistor updates. If set to a logic 0, the device is not write protected and can be written to via
the 2-wire interface. This pin has an internal pull-up resistor.
11 of 17

11 Page







PáginasTotal 17 Páginas
PDF Descargar[ Datasheet DS1847.PDF ]




Hoja de datos destacado

Número de piezaDescripciónFabricantes
DS1841Temperature-ControlledMaxim Integrated Products
Maxim Integrated Products
DS1842Bias Output StageMaxim Integrated Products
Maxim Integrated Products
DS1842ABias Output StageMaxim Integrated Products
Maxim Integrated Products
DS1843RSSI Burst-Mode Sample-and-Hold CircuitMaxim Integrated Products
Maxim Integrated Products

Número de piezaDescripciónFabricantes
SLA6805M

High Voltage 3 phase Motor Driver IC.

Sanken
Sanken
SDC1742

12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters.

Analog Devices
Analog Devices


DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares,
permitiéndote verlos en linea o descargarlos en PDF.


DataSheet.es    |   2020   |  Privacy Policy  |  Contacto  |  Buscar