Maxim-integrated MAXQ7667 Manual do Utilizador descarregar pdf (Página 252)

_________________________________________________________________________________________________________ 14-20

MAXQ7667 User’s Guide

Figure 14-11. Setting Up and Using the ADC Flow Chart

SELECT IN SAR ADC CONTROL REGISTER 

SARC:

A) DIFFERENTIAL OR SINGLE-ENDED

CONVERSION.

B) IF DIFFERENTIAL CONVERSION, 

SELECT UNIPOLAR OR BIPOLAR MODE.

C) SET SARASD IF ADC AUTO

SHUTDOWN IS REQUIRED.

D) SET SARRSEL TO EITHER SELECT

EXTERNAL/INTERNAL ADC REFERENCE

OR THE AVDD.

SELECT IN SARC REGISTER (CONT’d.): 

E) ADC CONVERSION START SOURCE: 

TIMERS 0–2, ADCCTL PIN, SW WRITE 

(START/BUSY BIT). 

F) SINGLE OR DUAL EDGE: FOR ADC

LOGIC-CONTROLLED ACQUISITION 

TIME, SELECT SINGLE EDGE (0); FOR 

USER-CONTROLLER ACQUISITION 

TIME, SELECT DUAL EDGE (1). 

G) ADC INPUT CHANNEL.

START ADC CONVERSION: 

DEPENDING ON ADC CONVERSION 

START SOURCE SET TIMER ENABLE 

(PIN IS ALREADY INPUT), OR ADC START/

BUSY BIT IN SARC TO TRIGGER 

CONVERSION. 

NOTE: FOR CONTINUOUS MODE, 

SELECTING 110 IN SARS[2:0] FIELD 

TRIGGERS CONVERSION.

IF POLLED CONVERSION, WAIT FOR 

SARRDY BIT IN ADC STATUS REGISTER 

TO BE SET BEFORE READING THE ADC 

DATA REGISTER. OTHERWISE, READ 

ADC DATA AFTER ADC DATA READY 

INTERRUPT.

READ AND SAVE 12-BIT ADC RESULT 

(CODE

) FROM ADC DATA REGISTER, SARD.

SELECT ADC CLOCK DIVIDE SARCD[1:0] 

RATIO IN THE OSCC REGISTER.

SELECT IN ADC POWER ENABLE

A) SET SARE (APE.4) TO ENABLE ADC.

B) IF INTERNAL BANDGAP REFERENCE IS

DESIRED, SET BGE (APE.12).

C) SET RBUFE (APE.14) TO ENABLE ADC 

REFERENCE BUFFER.

IF CONVERSION START SOURCE IS

GOING TO BE ONE OF THE TIMERS, 

CONFIGURE TIMER IN 16-BIT OR 8-BIT 

MODE. NOTE: TIMER OUTPUT IS

INTERNALLY SELECTED AS THE ADC START

TRIGGER CONTROL.

IF CONVERSION START SOURCE IS FROM

EXTERNAL ADCCTL PIN, ENSURE PIN IS

CONFIGURED AS INPUT.

TO GET ADC DATA READY INTERRUPT 

AFTER A CONVERSION, SET SARIE (AIE.0) 

BIT IN ANALOG INTERRUPT ENABLE 

GLOBAL INTERRUPT CONTROL BITS IM5 IN 

IMR AND IGE IN IC PERIPHERAL REGISTER.

1 2 ... 247 248 249 250 251 252 253 254 255 256 257 ... 346 347

Comentários a estes Manuais

Sem comentários

Maxim-integrated MAXQ7667 Manual do Utilizador Página 252

Comentários a estes Manuais

Manuais e produtos relacionados com Hardware Maxim-integrated MAXQ7667