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DS1856B-002+ PDF预览

DS1856B-002+

更新时间： 2024-01-22 02:10:49
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美信 - MAXIM 转换器数字电位计电阻器监视器
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DS1856B-002+ 数据手册

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Rev 1; 4/05  
Dual, Temperature-Controlled Resistors with Inter-  
nally Calibrated Monitors and Password Protection  
General Description  
Features  
♦ SFF-8472 Compatible  
The DS1856 dual, temperature-controlled, nonvolatile  
(NV) variable resistors with three monitors consists of  
two 256-position, linear, variable resistors; three analog  
monitor inputs (MON1, MON2, MON3); and 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  
minimal circuitry. The variable resistor settings are  
stored in EEPROM memory and can be accessed over  
the 2-wire serial bus.  
♦ Five Monitored Channels (Temperature, V  
,
CC  
MON1, MON2, MON3)  
♦ Three External Analog Inputs (MON1, MON2, MON3)  
That Support Internal and External Calibration  
♦ Scalable Dynamic Range for External Analog Inputs  
♦ Internal Direct-to-Digital Temperature Sensor  
♦ Alarm and Warning Flags for All Monitored  
Channels  
♦ Two Linear, 256-Position, Nonvolatile Temperature-  
Controlled Variable Resistors  
♦ Resistor Settings Changeable Every 2°C  
♦ Three Levels of Security  
♦ Access to Monitoring and ID Information  
Configurable with Separate Device Addresses  
♦ 2-Wire Serial Interface  
♦ Two Buffers with TTL/CMOS-Compatible Inputs and  
Open-Drain Outputs  
♦ Operates from a 3.3V or 5V Supply  
♦ -40°C to +95°C Operating Temperature Range  
Relative to other members of the family, the DS1856 is  
essentially a DS1859 with a DS1852-friendly memory  
map. In particular, the DS1856 can be configured so  
the 128 bytes of internal Auxiliary EEPROM memory is  
mapped into Main Device Table 00h and Table 01h,  
maintaining compatibility between both the  
DS1858/DS1859 and the DS1852. The DS1856 also  
features password protection equivalent to the DS1852,  
further enhancing compatibility between the two.  
Applications  
Optical Transceivers  
Ordering Information  
Optical Transponders  
Instrumentation and Industrial Controls  
RF Power Amps  
RES0/RES1  
PART  
RESISTANCE  
PIN-PACKAGE  
(kΩ)  
Diagnostic Monitoring  
DS1856E-050  
50/50  
50/50  
50/50  
16 TSSOP  
DS1856E-050/T&R  
DS1856B-050  
16 TSSOP  
16-Ball CSBGA  
Typical Operating Circuit  
Ordering Information continued at end of data sheet.  
+Denotes lead free.  
*Future product—contact factory for availability.  
T&R denotes tape-and-reel.  
V
CC  
V
CC  
= 3.3V  
All parts operate at the -40°C to +95°C temperature range.  
4.7kΩ  
2-WIRE  
4.7kΩ  
DECOUPLING  
CAPACITOR  
0.1µF  
Pin Configurations  
16  
1
V
CC  
SDA  
15  
14  
2
TO LASER BIAS  
CONTROL  
TOP VIEW  
H1  
L1  
INTERFACE  
SCL  
OUT1  
IN1  
SDA  
1
2
3
4
5
6
7
8
16 V  
CC  
3
4
A
B
C
D
V
IN1  
SCL  
SDA  
IN2  
H1  
L1  
CC  
TO LASER  
MODULATION  
CONTROL  
13  
12  
SCL  
OUT1  
IN1  
15 H1  
Tx-FAULT  
H0  
L0  
14 L1  
5
6
OUT2  
H0  
DS1856  
OUT2  
13 H0  
LOS  
DS1856  
11  
10  
9
Rx POWER*  
IN2  
MON3  
MON2  
MON1  
OUT2  
IN2  
12 L0  
N.C.  
OUT1  
MON3  
7
8
Tx POWER*  
Tx BIAS*  
DIAGNOSTIC  
INPUTS  
N.C.  
GND  
11 MON3  
10 MON2  
N.C.  
GND  
GND  
1
L0  
2
MON1  
3
MON2  
4
9
MON1  
*SATISFIES SFF-8472 COMPATIBILITY  
CSBGA (4mm x 4mm)  
1.0mm PITCH  
TSSOP  
______________________________________________ Maxim Integrated Products  
1
For pricing delivery, and ordering information please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
1234567...31

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