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參數資料
| 型號： | DS28EA00U+T&R |
| 廠商： | Maxim Integrated |
| 文件頁數： | 9/29頁 |
| 文件大小： | 328K |
| 描述： | IC THERMOMETER 1-WIRE 8-USOP |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 3,000 |
| 功能： | 溫度計，恒溫計 |
| 傳感器類型： | 內部 |
| 感應溫度： | -40°C ~ 85°C |
| 精確度： | ±0.5°C（最小值） |
| 拓撲： | 寄存器庫，變簽式暫存器 |
| 輸出類型： | 數字 |
| 輸出警報： | 是 |
| 輸出風扇： | 無 |
| 電源電壓： | 3 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應商設備封裝： | 8-uMAX |
| 包裝： | 帶卷 (TR) |
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The functional assignments of the individual bits are
explained in the table below. Bits [4:0] and bit 7 have
no function and cannot be changed by the user. As a
factory default, the device operates in 12-bit resolution.
1-Wire Digital Thermometer with
Sequence Detect and PIO
DS28EA00
Maxim Integrated
9
ADDRRESS
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
4h
0
R1
R0
1
1
1
1
1
BIT DESCRIPTION
BIT(S)
DEFINITION
R1, R0: Temperature
Converter Resolution
[6:5]
These bits control the resolution of the temperature converter. The codes are as follows:
R1
R0
0
0
9 bits
0
1
10 bits
1
0
11 bits
1
1
12 bits
DEVICE BEHAVIOR
CHAIN STATE
PIOB (EN)
PIOA (DONE)
CONDITIONAL READ ROM
OFF (Default)
PIO (High Impedance)
PIO (High Impedance)
Not Recognized
ON
EN Input
Pullup On
Recognized if EN is 0
DONE
No Function
Pulldown On (DONE Logic 0)
Not Recognized
Table 2. Chain States
PIO Structure
Each PIO consists of an open-drain pulldown transistor
and an input path to read the pin state. The transistor is
controlled by the PIO output latch, as shown in Figure
5. The device function control unit connects the PIO
pins logically to the 1-Wire interface. PIOA has a pullup
path to internal V
DD
to facilitate the sequence-detect
function (see the Block Diagram) in conjunction with the
Chain command; PIOB is truly an open-drain structure.
The power-on default state of the PIO output transistors
is off; high-impedance, on-chip resistors (not shown in
Figure 5) pull the PIO pins to internal V
DD
.
Chain Function
The chain function is a feature that allows the 1-Wire
master to discover the physical sequence of devices
that are wired as a linear network (chain). This is partic-
ularly convenient for devices that are installed at equal
spacing along a long cable (e.g., to measure tempera-
tures at different locations inside a storage tower or
tank). Without chain function, the master needs a
lookup table to correlate the registration number to the
physical location.
The chain function requires two pins: an input (EN) to
enable a device to respond during the discovery and
an output (DONE) to inform the next device in the chain
that the discovery of its neighbor is done. The two gen-
eral-purpose ports of the DS28EA00 are reused for the
chain function. PIOB functions as an EN input and PIOA
generates the DONE signal, which is connected to the
EN input of the next device, as shown in the Typical
Operating Circuit. The EN input of the first device in the
chain needs to be hardwired to GND or logic 0 must be
applied for the duration of the sequence discovery
process. Besides the two pins, the sequence discovery
relies on the Conditional Read ROM command.
For the chain function and normal PIO operation to
coexist, the DS28EA00 distinguishes three chain states:
OFF, ON, and DONE. The transition from one chain
state to another is controlled through the Chain com-
mand. Table 2 summarizes the chain states and the
specific behavior of the PIO pins.
D
Q
Q
PIO OUTPUT LATCH
CLOCK
PIO PIN
PIO PIN STATE
PIO OUTPUT LATCH STATE
PIO DATA
PIO CLOCK
Figure 5. PIO Simplified Logic Diagram
Configuration Register
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