MAX1361MEUB+T【PDF 8/24 页】IC SYSTEM MON 10BIT 4CH 10-UMAX

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MAX1361/MAX1362

Reading a Conversion (Read Cycle)

Initiate a read cycle to start a conversion sequence and

to obtain conversion results. See the

Scan Modes

section for details on the channel-scan sequence. Read

cycles begin with the bus master issuing a START

condition followed by 7 address bits and a read bit

(R/W = 1). After successfully receiving the address byte,

the MAX1361/MAX1362 (slave) issue an ACK. The master

then reads from the slave. (See Figures 10–13.)

The result is transmitted in 2 bytes. The 1st byte con-

sists of a leading 1 followed by a 2-bit binary channel

address tag, a 12/10 bit flag (0 for the MAX1361/

MAX1362), 2 bits of 1s, the first 2 bits of the data result,

and the expected ACK from the master. The 2nd byte

4-Channel, 10-Bit, System Monitor with Programmable

Trip Window and SMBus Alert Response

______________________________________________________________________________________

BIT

NAME

DESCRIPTION

7 (MSB)

Setup

Setup byte always starts with 1.

REF/AIN SEL1

REF/AIN SEL0

When [0,0], REF/AIN3 = AIN3, REF = VDD.

When [0,1], REF/AIN3 = REF, REF = external reference.

When [1,0], REF/AIN3 = AIN3, REF = internal reference.

When [1,1], REF/AIN3 = REF, REF = internal reference.

(Table 3)

INT REF Power

Down

1 = internal reference always powered up.

0 = internal reference always powered down.

(Table 3)

INT/EXT Clock

0 = internal clock.

1 = external clock (MAX1361/MAX1362 use the SCL clock for conversions).

UNI/BIP

0 = unipolar.

1 = bipolar.

Selects unipolar or bipolar conversion mode. In unipolar mode, analog signal in 0 to VREF range

can be converted. In differential bipolar mode, input signal can range from -VREF/2 to +VREF/2.

When single-ended mode is chosen, the SE/

DIF bit of configuration byte overrides UNI/BIP, and

conversions are performed in unipolar mode.

Reset

1 = no action.

0 = resets

INT and configuration register. Setup register and channel trip thresholds are unaffected.

Monitor Setup

0 = no action.

1 = extends writing up to 13 bytes (104 bits) of alarm reset mask. Scans speed selection and

alarm thresholds. See the Configuring Monitor Mode section.

Table 4. Setup-Byte Format*

Power-on defaults: 0x82

CS1

CS0

CH0

CH1

CH2

CH3

Table 5. Channel Selection in Single-

Ended Mode (SE/DIF = 1)

CS1

CS0

CH0

CH1

CH2

CH3

Table 6. Channel Selection in Differential

Mode (SE/DIF = 0)

SE/DIF

UNI/BIP

MODE

Differential inputs, unipolar

Differential inputs, bipolar

Single-ended inputs, unipolar

Table 7. SE/DIF and UNI/BIP Table

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