ML620Q503/Q504 User's Manual
Chapter 24 RC Oscillation Type A/D Converter
FEUL620Q504 24-21
The content of Counter A at this time becomes the A/D conversion value nA1, which is expressed by the
following expression:
nA1
=
nB0•
t
RCCLK
(RT0)
... Expression C
t
BSCLK
From expressions B and C, nA1 is expressed by the following expression:
nA1
=
nA0•
t
RCCLK
(RT0)
... Expression D
t
RCCLK
(RS0)
The t
RCCLK
(RS0) is the oscillator clock period by reference resistor RS0 and t
RCCLK
(RT0) the oscillator clock
period by thermistor RT0.
Since the oscillation period is expressed by "t
RCCLK
= k
RCCLK
x R x C", t
RCCLK
(RS0) and t
RCCLK
(RT0) are
expressed by the following expressions:
t
RCCLK
(RS0)
=
k
RCCLK
• (CS0+CVR) •RS0
... Expression E
t
RCCLK
(RT0)
=
k
RCCLK
• (CS0+CVR) •RT0
When expression E is substituted for expression D, nA1 will be:
nA1
=
nA0•
RT0
RS0
Since “nA0” (“4B0H” in this example) and RS0 are constants whose values are fixed, “nA1” is a digital value
proportional to RT0. This very “nA1” corresponds to “nT0” in expression A.
That concludes the description of the A/D conversion method using a thermistor. “nA1” that has been obtained
must further be converted to a value such as a temperature indication value for thermometer by program
according to the temperature-to-resistance characteristics of the thermistor.
Содержание LAPIS SEMICONDUCTOR ML620Q503
Страница 2: ...ML620Q503 Q504 User s Manual Issue Date Apr 16 2015 FEUL620Q504 01...
Страница 18: ...Chapter 1 Overview...
Страница 32: ...Chapter 2 CPU and Memory Space...
Страница 44: ...Chapter 3 Reset Function...
Страница 50: ...Chapter 4 Power Management...
Страница 70: ...Chapter 5 Interrupts...
Страница 134: ...Chapter 6 Clock Generation Circuit...
Страница 161: ...Chapter 7 Time Base Counter...
Страница 170: ...Chapter 8 Timers...
Страница 183: ...Chapter 9 Function Timer FTM...
Страница 231: ...Chapter 10 Watchdog Timer...
Страница 239: ...Chapter 11 Synchronous Serial Port SSIO...
Страница 251: ...Chapter 12 Synchronous Serial Port with FIFO SSIOF...
Страница 283: ...Chapter 13 UART...
Страница 303: ...Chapter 14 UART with FIFO UARTF...
Страница 327: ...Chapter 15 I2 C Bus Interface...
Страница 344: ...Chapter 16 Port XT...
Страница 350: ...Chapter 17 Port 0...
Страница 361: ...Chapter 18 Port 1...
Страница 368: ...Chapter 19 Port2...
Страница 379: ...Chapter 20 Port 3...
Страница 395: ...Chapter 21 Port 4...
Страница 410: ...Chapter 22 Port 5...
Страница 426: ...Chapter 23 Melody Driver...
Страница 439: ...Chapter 24 RC Oscillation type A D Converter RC ADC...
Страница 462: ...Chapter 25 Successive Approximation Type A D Converter SA ADC...
Страница 479: ...Chapter 26 Analog Comparator...
Страница 489: ...Chapter 27 Flash Memory Control...
Страница 505: ...Chapter 28 Voltage Level Supervisor VLS...
Страница 517: ...Chapter 29 LLD circuit...
Страница 519: ...Chapter 30 On Chip Debug Function...
Страница 522: ...Appendixes...
Страница 552: ...Revision History...