DS1825U+

更新时间： 2024-02-16 22:44:25

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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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

1-Wire SIGNALING

The DS1825 uses a strict 1-Wire communication protocol to insure data integrity. Several signal types are defined

by this protocol: reset pulse, presence pulse, write 0, write 1, read 0, and read 1. All of these signals, with the

exception of the presence pulse, are initiated by the bus master.

INITIALIZATION PROCEDURE: RESET AND PRESENCE PULSES

All communication with the DS1825 begins with an initialization sequence that consists of a reset pulse from the

master followed by a presence pulse from the DS1825. This is illustrated in Figure 13. When the DS1825 sends the

presence pulse in response to the reset, it is indicating to the master that it is on the bus and ready to operate.

During the initialization sequence the bus master transmits (T_X) the reset pulse by pulling the 1-Wire bus low for a

minimum of 480ꢀs. The bus master then releases the bus and goes into receive mode (R_X). When the bus is

released, the 5k pullup resistor pulls the 1-Wire bus high. When the DS1825 detects this rising edge, it waits 15–

60ꢀs and then transmits a presence pulse by pulling the 1-Wire bus low for 60–240ꢀs.

Figure 14. INITIALIZATION TIMING

MASTER T_XRESET PULSE

MASTER R_X

480 ꢀs minimum

DS1825 T_X

presence pulse

DS1825

60-240 ꢀs

waits 15-60 ꢀs

V_PU

1-WIRE BUS

GND

LINE TYPE LEGEND

Bus master pulling low

DS1825 pulling low

Resistor pullup

READ/WRITE TIME SLOTS

The bus master writes data to the DS1825 during write time slots and reads data from the DS1825 during read time

slots. One bit of data is transmitted over the 1-Wire bus per time slot.

WRITE TIME SLOTS

There are two types of write time slots: “Write 1” time slots and “Write 0” time slots. The bus master uses a Write 1

time slot to write a logic 1 to the DS1825 and a Write 0 time slot to write a logic 0 to the DS1825. All write time slots

must be a minimum of 60ꢀs in duration with a minimum of a 1ꢀs recovery time between individual write slots. Both

types of write time slots are initiated by the master pulling the 1-Wire bus low (see Figure 14).

To generate a Write 1 time slot, after pulling the 1-Wire bus low, the bus master must release the 1-Wire bus within

15ꢀs. When the bus is released, the 5k pullup resistor will pull the bus high. To generate a Write 0 time slot, after

pulling the 1-Wire bus low, the bus master must continue to hold the bus low for the duration of the time slot (at

least 60ꢀs).

The DS1825 samples the 1-Wire bus during a window that lasts from 15ꢀs to 60ꢀs after the master initiates the

write time slot. If the bus is high during the sampling window, a 1 is written to the DS1825. If the line is low, a 0 is

written to the DS1825.

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DS1825UTR	MAXIM	Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID	获取价格
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DS1830+	MAXIM	Power Supply Support Circuit, Fixed, 1 Channel, PDIP8, 0.300 INCH, DIP-8	获取价格

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