C8051F045 View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

C8051F045

Mixed Signal ISP Flash MCU Family

Silicon Laboratories 

C8051F040/1/2/3/4/5/6/7

7.3.2. Window Detector in Differential Mode

Figure 7.6 shows two example window comparisons for differential mode, with ADC2LT = 0x10 (+16d) and

ADC2GT = 0xFF (–1d). Notice that in Differential mode, the codes vary from –VREF to VREF x (127/128)

and are represented as 8-bit 2s complement signed integers. In the left example, an AD2WINT interrupt

will be generated if the ADC2 conversion word (ADC2L) is within the range defined by ADC2GT and

ADC2LT (if 0xFF (–1d) < ADC2 < 0x0F (16d)). In the right example, an AD2WINT interrupt will be gener-

ated if ADC2 is outside of the range defined by ADC2GT and ADC2LT (if ADC2 < 0xFF (–1d) or ADC2 >

0x10 (+16d)).

Input Voltage

(P1.x - P1.y)

REF x (127/128)

ADC2

0x7F (127d)

REF x (16/128)

REF x (-1/256)

0x11 (17d)

0x10 (16d)

0x0F (15d)

0x00 (0d)

0xFF (-1d)

0xFE (-2d)

AD2WINT

not affected

ADC2LT

AD2WINT=1

ADC2GT

Input Voltage

(P1.x - P1.y)

REF x (127/128)

ADC2

0x7F (127d)

REF x (16/128)

REF x (-1/256)

0x11 (17d)

0x10 (16d)

0x0F (15d)

0x00 (0d)

0xFF (-1d)

0xFE (-2d)

AD2WINT=1

ADC2GT

AD2WINT

not affected

ADC2LT

-REF

0x80 (-128d)

AD2WINT

not affected

-REF

0x80 (-128d)

AD2WINT=1

Figure 7.6. ADC Window Compare Examples, Differential Mode

102

Rev. 1.5

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