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參數資料
| 型號： | MAX31826MUA+T |
| 廠商： | Maxim Integrated |
| 文件頁數： | 18/22頁 |
| 文件大小： | 1648K |
| 描述： | IC TEMP SENSOR DIGITAL 8UMAX |
| 標準包裝： | 2,500 |
| 系列： | 1-Wire® |
| 功能： | 溫度監控系統（傳感器） |
| 傳感器類型： | 內部 |
| 感應溫度： | -55°C ~ 125°C |
| 精確度： | ±2°C |
| 拓撲： | 寄存器庫，變簽式暫存器 |
| 輸出類型： | 1-Wire? |
| 輸出警報： | 無 |
| 輸出風扇： | 無 |
| 電源電壓： | 3 V ~ 3.7 V |
| 工作溫度： | -55°C ~ 125°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) |
Maxim Integrated Products 18
MAX31826
1-Wire Digital Temperature Sensor
with 1Kb Lockable EEPROM
Read/Write Time Slots
The bus master writes data to the device during write
time slots and reads data from the device 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-one time
slots and write-zero time slots. The bus master uses a
write-one time slot to write a logic 1 to the device and
a write-zero time slot to write a logic 0 to the device. All
write time slots must have a 60Fs (min) duration with a
1Fs (min) recovery time between individual write slots.
Both types of write time slots are initiated by the master
pulling the 1-Wire bus low (Figure 11).
To generate a write-one time slot, after pulling the 1-Wire
bus low, the bus master must release the 1-Wire bus
within 15Fs. When the bus is released, the 5kI pullup
resistor pulls the bus high. To generate a write-zero 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 60Fs).
The device samples the 1-Wire bus during a window that
lasts from 15Fs to 60Fs after the master initiates the write
time slot. If the bus is high during the sampling window,
a 1 is written to the device. If the line is low, a 0 is written
to the device.
Read Time Slots
The device can only transmit data to the master when
the master issues read time slots. Therefore, the master
must generate read time slots immediately after issuing
a Read Scratchpad 1 command or Read Power Supply
command, so that the device can provide the requested
data. In addition, the master can generate read time
slots after issuing a Convert T command to verify the
operation status as explained in the MAX31826 Function
Commands section.
All read time slots must be 60Fs (min) in duration with a
1Fs (min) recovery time between slots. A read time slot
is initiated by the master device pulling the 1-Wire bus
low for a minimum of 1Fs (t
INIT
) and then releasing the
bus (Figure 11). After the master initiates the read time
slot, the device begins transmitting a 1 or 0 on bus. The
device transmits a 1 by leaving the bus high and trans-
mits a 0 by pulling the bus low. When transmitting a 0,
the device releases the bus by the end of the time slot,
and the pullup resistor pulls the bus back to its high idle
state. Output data from the device is valid for 15Fs after
the falling edge that initiated the read time slot. Therefore,
the master must release the bus and then sample the bus
state within 15Fs from the start of the slot.
Figure 12 illustrates that the sum of t
INIT
, t
RC
, and the
master sample window must be less than 15Fs for a read
time slot. t
RC
is the rise time due to the resistive and
capacitive characteristics of the bus. Figure 13 shows
that system timing margin is maximized by keeping t
INIT
and t
RC
as short as possible and by locating the master
sample time during read time slots towards the end of
the 15Fs period.
Figure 10. Initialization Timing
V
PU
1-Wire BUS
MASTER Tx RESET PULSE
480祍 MINIMUM
MASTER Rx
480祍 MINIMUM
MAX31826 Tx PRESENCE PULSE
60祍 TO 240祍
MAX31826 WAITS
15祍 TO 60祍
GND
BUS MASTER PULLING LOW
MAX31826 PULLING LOW
RESISTOR PULLUP
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