参数资料
型号: TMP03FT9
厂商: Analog Devices Inc
文件页数: 12/16页
文件大小: 214K
描述: IC SENSOR TEMP/SERIAL OC TO-92-3
标准包装: 100
功能: 温度监控系统(传感器)
传感器类型: 内部
感应温度: -40°C ~ 100°C
精确度: ±4°C(最小值)
拓扑: ADC(三角积分型),数字调制器
输出类型: 开路集电极
输出警报:
输出风扇:
电源电压: 4.5 V ~ 7 V
工作温度: -55°C ~ 150°C
安装类型: 通孔
封装/外壳: TO-226-3、TO-92-3 标准主体
供应商设备封装: TO-92-3
包装: 散装
TMP03/TMP04
REV. A
12
Listing 1. An 80C51 Software Routine for the TMP04
;
; Test of a TMP04 interface to the 8051,
; using timer 0 and timer 1 to measure the duty cycle
;
; This program has three steps:
; 1. Clear the timer registers, then wait for a low-to-
; high transition on input P1.0 (which is connected
; to the output of the TMP04).
; 2. When P1.0 goes high, timer 0 starts. The program
; then loops, testing P1.0.
; 3. When P1.0 goes low, timer 0 stops & timer 1 starts. The
; program loops until P1.0 goes low, when timer 1 stops
; and the TMP04s T1 and T2 values are stored in Special
; Function registers 8AH through 8DH (TL0 through TH1).
;
;
; Primary controls
$MOD51
$TITLE(TMP04 Interface, Using T0 and T1)
$PAGEWIDTH(80)
$DEBUG
$OBJECT
;
; Variable declarations
;
PORT1
DATA
90H
;SFR register for port 1
;TCON
DATA
88H
;timer control
;TMOD
DATA
89H
;timer mode
;TH0
DATA
8CH
;timer 0 hi byte
;TH1
DATA
8DH
;timer 1 hi byte
;TL0
DATA
8AH
;timer 0 lo byte
;TL1
DATA
8BH
;timer 1 low byte
;
;
ORG
100H
;arbitrary start
;
READ_TMP04:
MOV
A,#00
;clear the
MOV
TH0,A
; counters
MOV
TH1,A
; first
MOV
TL0,A
;
MOV
TL1,A
;
WAIT_LO:
JB
PORT1.0,WAIT_LO
;wait for TMP04 output to go low
MOV
A,#11H
;get ready to start timer0
MOV
TMOD,A
WAIT_HI:
JNB
PORT1.0,WAIT_HI
;wait for output to go high
;
;Timer 0 runs while TMP04 output is high
;
SETB
TCON.4
;start timer 0
WAITTIMER0:
JB
PORT1.0,WAITTIMER0
CLR
TCON.4
;shut off timer 0
;
;Timer 1 runs while TMP04 output is low
;
SETB
TCON.6
;start timer 1
WAITTIMER1:
JNB
PORT1.0,WAITTIMER1
CLR
TCON.6
;stop timer 1
MOV
A,#0H
;get ready to disable timers
MOV
TMOD,A
RET
END
Software for the interface is shown in Listing 1. The program
monitors the TMP04 output, and turns the counters on and off
to measure the duty cycle. The time that the output is high is mea-
sured by Timer 0, and the time that the output is low is measured
by Timer 1. When the routine finishes, the results are available
in Special Function Registers (SFRs) 08AH through 08DH.
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