MAX11647EUA+T【PDF 5/22 页】IC ADC 10BIT I2C 94.4KSPS 8UMAX

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MAX11646/MAX11647

Low-Power, 1-/2-Channel, I2C, 10-Bit ADCs

in Ultra-Tiny 1.9mm x 2.2mm Package

______________________________________________________________________________________

Slave Address

A bus master initiates communication with a slave device

by issuing a START condition followed by a slave

address. When idle, the MAX11646/MAX11647 continu-

ously wait for a START condition followed by their slave

address. When the MAX11646/MAX11647 recognize their

slave address, they are ready to accept or send data.

The slave address has been factory programmed and is

always 0110110 for the MAX11646/MAX11647 (Figure 7).

The least significant bit (LSB) of the address byte (R/W)

determines whether the master is writing to or reading

from the MAX11646/MAX11647 (R/W = 0 selects a write

condition, R/W = 1 selects a read condition). After receiv-

ing the address, the MAX11646/MAX11647 (slave) issue

an acknowledge by pulling SDA low for one clock cycle.

Bus Timing

At power-up, the MAX11646/MAX11647 bus timing is set

for fast mode (F/S mode), allowing conversion rates up to

22.2ksps. The MAX11646/MAX11647 must operate in

high-speed mode (HS mode) to achieve conversion

rates up to 94.4ksps. Figure 1 shows the bus timing for

the MAX11646/MAX11647’s 2-wire interface.

HS Mode

At power-up, the MAX11646/MAX11647 bus timing is

set for F/S mode. The bus master selects HS mode by

addressing all devices on the bus with the HS-mode

master code 0000 1XXX (X = don’t care). After suc-

cessfully receiving the HS-mode master code, the

MAX11646/MAX11647 issue a not-acknowledge, allow-

ing SDA to be pulled high for one clock cycle

(Figure 8). After the not-acknowledge, the MAX11646/

MAX11647 are in HS mode. The bus master must then

send a repeated START followed by a slave address to

initiate HS-mode communication. If the master gener-

ates a STOP condition the MAX11646/MAX11647 return

to F/S mode.

R/W

SLAVE ADDRESS

SCL

SDA

567

DEVICE

SLAVE ADDRESS

0110110

MAX11646/MAX11647

Figure 7. Slave Address Byte

000

HS-MODE MASTER CODE

SCL

SDA

F/S MODE

HS MODE

Figure 8. F/S-Mode to HS-Mode Transfer

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