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參數(shù)資料
| 型號(hào)： | MAX6631MUT-T |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | 12-Bit Sign Digital Temperature Sensors with Serial Interface |
| 中文描述： | 12位注冊(cè)數(shù)字溫度傳感器的串行接口 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 152K |
| 代理商： | MAX6631MUT-T |
M
12-Bit + Sign Digital Temperature Sensors
with Serial Interface
6
_______________________________________________________________________________________
finish.
CS
’
s falling edge stops any conversion in
progress, and data is latched into the shift register.
Then the data clocks out at SO on SCK
’
s falling edge
with the sign bit (D15) first, followed by the MSB. Data
is sent in one 16-bit word, and
CS
must remain low until
all 16 bits are transferred. If
CS
goes high in the middle
of a transmission, it is necessary to wait the conversion
time (less than 300ms) before attempting a new read.
The serial data is composed of 12 + 1 data bits
(D15
–
D3) and 3 trailing bits (D2
–
D0). D2 is always low,
serving as the confirmation bit that the device has been
communicated with. The last 2 bits, D0 and D1, are
undefined and are always in high-impedance mode
(Table 1). The power-up state for SO is high imped-
ance. Figure 3 shows the detailed serial timing specifi-
cations for the SPI port. The temperature data format is
in two's complement format (Table 2).
Power Shutdown Mode
The MAX6629
–
MAX6632 do not have a built-in power
software shutdown mode. However, a power shutdown
mode is easily implemented utilizing an unused logic
gate. A typical CMOS or TTL logic output has enough
drive capability to serve as the power source if its out-
put voltage level exceeds 3V, as shown in Figure 1.
Drive the logic output low to provide a hardware shut-
down mode.
Idle Mode
The MAX6629
–
MAX6632 can be put into idle mode by
pulling
CS
low. Data can be clocked out when the
device is in idle mode.
Power-On Reset (POR)
The POR supply voltage of the MAX6629
–
MAX6632 is
typically 1.6V. Below this supply voltage the interface is
inactive and the data register is set to the POR state,
0
°
C.
When power is first applied and V
CC
rises above 1.6V
(typ), the device starts to convert, although temperature
reading is not recommended at V
CC
levels below 3.0V.
Figure 3. SPI Timing Diagram
D15
D0
D1
D2
D3
SCK
SO
t
DV
t
CSS
t
DO
CS
t
TR
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Sign
MSB
Data
LSB
Data
Low
High-Z
High-Z
Table 1. Data Output Format
Table 2. Temperature Data Format
(Two
’
s Complement)
DIGITAL OUTPUT (BINARY)
D15
–
D3
0,1001,0110,0000
0,0111,1101,0000
0,0001,1001,0000
0,0000,0000,0001
0,0000,0000,0000
1,1111,1111,1111
1,1110,0111,0000
1,1100,1001,0000
TEMPERATURE
(
°
C)
D2
0
0
0
0
0
0
0
0
D1, D0
XX
XX
XX
XX
XX
XX
XX
XX
150
125
25
0.0625
0
-0.0625
-25
-55
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