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TMP05 Datenblatt(PDF) 15 Page - Analog Devices

Teilenummer TMP05
Bauteilbeschribung  짹0.5째C Accurate PWM Temperature Sensor in 5-Lead SC-70
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TMP05 Datenblatt(HTML) 15 Page - Analog Devices

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TMP05/TMP06
Rev. 0 | Page 15 of 28
OUT
MICRO
IN
TMP05/
TMP06
CONV/IN
OUT
#1
TMP05/
TMP06
CONV/IN
OUT
#2
TMP05/
TMP06
CONV/IN
OUT
#3
TMP05/
TMP06
CONV/IN
OUT
#N
The temperature equation for the high state conversion rate is
Temperature (°C) = 421 − (93.875 × (TH/TL))
(3)
Table 9. Conversion Times Using Equation 3
Temperature (°C)
TL (ms)
High Cycle Time (ms)
–40
16.3
96.2
–30
16.7
96.6
–20
17
97.03
–10
17.4
97.42
0
17.8
97.84
10
18.3
98.27
20
18.7
98.73
25
19
98.96
30
19.2
99.21
40
19.7
99.71
50
20.2
100.24
60
20.8
100.8
70
21.4
101.4
80
22
102.02
90
22.7
102.69
100
23.4
103.4
110
24.1
104.15
120
25
104.95
130
25.8
105.81
140
26.7
106.73
150
27.7
107.71
Figure 25. Daisy-Chain Structure
A second microcontroller line is needed to generate the conver-
sion start pulse on the CONV/IN pin. The pulse width of the
start pulse should be less than 25 µs. The start pulse on the
CONV/IN pin lets the first TMP05/TMP06 part know that it
should start a conversion and output its own temperature now.
Once the part has output its own temperature, it then outputs a
start pulse for the next part on the daisy-chain link. The pulse
width of the start pulse from each TMP05/TMP06 part is
typically 17 µs.
Figure 26 shows the start pulse on the CONV/IN pin of the first
device on the daisy chain and Figure 27 shows the PWM output
by this first part.
START
PULSE
<25
µs
T0
TIME
CONVERSION
STARTS ON
THIS EDGE
MUST GO HIGH ONLY
AFTER START PULSE HAS
BEEN OUTPUT BY LAST
TMP05/TMP06 ON DAISY CHAIN.
Daisy-Chain Mode
Setting the FUNC pin to a high state allows multiple TMP05/
TMP06s to be connected together and, therefore, allows one
input line of the microcontroller to be the sole receiver of all
temperature measurements. In this mode, the CONV/IN pin
operates as the input of the daisy chain, and conversions take
place at the nominal conversion rate of TH/TL = 40 ms/ 76 ms
at 25°C.
Therefore, the temperature equation for the daisy-chain mode
of operation is
Figure 26. Start Pulse at CONV/IN Pin of First TMP05/TMP06 Device
on Daisy Chain
Temperature (°C) = 421 − (751 × (TH/TL))
(4)
START
PULSE
17
µs
#1 TEMP MEASUREMENT
T0
TIME
Figure 27. Daisy-Chain Temperature Measurement
and Start Pulse Output from First TMP05/TMP06



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