DS1825U+

更新时间： 2024-01-27 12:10:56

品牌	Logo	应用领域
美信 - MAXIM		模拟IC 信号电路光电二极管
页数	文件大小	规格书
21页	286K
描述
Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID

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技术参数
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DS1825U+ 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	SOIC
包装说明：	TSSOP,	针数：	8
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	Factory Lead Time：	6 weeks
风险等级：	0.94	Samacsys Description：	Board Mount Temperature Sensors Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID
模拟集成电路 - 其他类型：	ANALOG CIRCUIT	JESD-30 代码：	S-PDSO-G8
JESD-609代码：	e3	长度：	3 mm
湿度敏感等级：	1	功能数量：	1
端子数量：	8	最高工作温度：	125 °C
最低工作温度：	-55 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	TSSOP	封装形状：	SQUARE
封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	峰值回流温度（摄氏度）：	260
认证状态：	Not Qualified	座面最大高度：	1.1 mm
最大供电电压 (Vsup)：	3.7 V	最小供电电压 (Vsup)：	3 V
表面贴装：	YES	温度等级：	MILITARY
端子面层：	Matte Tin (Sn)	端子形式：	GULL WING
端子节距：	0.65 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	30	宽度：	3 mm

DS1825U+ 数据手册

DS1825 Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID

OVERVIEW

Figure 1 shows a block diagram of the DS1825, and pin descriptions are given in Table 1. The 64-bit ROM stores

the device’s unique serial code. The scratchpad memory contains the 2-byte temperature register that stores the

digital output from the temperature sensor. In addition, the scratchpad provides access to the 1-byte upper and

lower alarm trigger registers (T_Hand T_L), and the 1-byte configuration register. The configuration register allows the

user to set the resolution of the temperature-to-digital conversion to 9, 10, 11, or 12 bits. It is also used for the hard-

wired address programmed by the AD0-AD3 pins. The T_H, T_L, and configuration registers are NV (EEPROM), so

they will retain data when the device is powered down.

The DS1825 uses Dallas’ exclusive 1-Wire bus protocol that implements bus communication using one control

signal. The control line requires a weak pullup resistor since all devices are linked to the bus through a 3-state or

open-drain port (the DQ pin in the case of the DS1825). In this bus system, the microprocessor (the master device)

identifies and addresses devices on the bus using each device’s unique 64-bit code. Because each device has a

unique code, the number of devices that can be addressed on one bus is virtually unlimited. The 1-Wire bus

protocol, including detailed explanations of the commands and “time slots,” is covered in the 1-Wire BUS SYSTEM

section of this data sheet.

Another feature of the DS1825 is the ability to operate without an external power supply. Power is instead supplied

through the 1-Wire pullup resistor through the DQ pin when the bus is high. The high bus signal also charges an

internal capacitor (C_PP), which then supplies power to the device when the bus is low. This method of deriving

power from the 1-Wire bus is referred to as “parasite power.” As an alternative, the DS1825 can also be powered

by an external supply on V_DD.

Figure 1. DS1825 BLOCK DIAGRAM

VPULLUP

4.7k

Memory

Control Logic

Parasite

Power

Circuit

16-bit Temp Reg

8-bit TH Register

8-bit TL Register

8-bit CRC Gen

64-Bit ROM

And

GND

Cpp

1-wire Port

Power

Supply

Sense

VDD

8-bit Config. Reg

Address Pin

Input Latch

AD0-AD3

4 of 21

1 2 345 6 7...21

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与DS1825U+相关器件

型号	品牌	描述	获取价格	数据表
DS1825U+TR	MAXIM	Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID	获取价格
DS1825UTR	MAXIM	Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID	获取价格
DS1830	DALLAS	Reset Sequence Pushbutton	获取价格
DS1830	MAXIM	Power Supply Support Circuit, Adjustable, 1 Channel, PDIP8,	获取价格
DS1830	ADI	顺序复位按钮	获取价格
DS1830+	MAXIM	Power Supply Support Circuit, Fixed, 1 Channel, PDIP8, 0.300 INCH, DIP-8	获取价格

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