If the internal reference is used and R/W = 0, shutdown

occurs when the master issues a not-acknowledge bit

while reading the conversion results. The internal refer-

ence and internal reference buffer are disabled during

shutdown, reducing the analog supply current to less

than 1µA.

A dummy conversion is required to power up the inter-

nal reference. The MAX1069 internal reference begins

powering up from shutdown on the 9th falling edge of a

valid address byte. Allow 12ms for the internal refer-

ence to settle before obtaining valid conversion results.

Reference Voltage

The MAX1069 provides an internal or accepts an exter-

nal reference voltage. The ADC input range is from

58.6ksps, 14-Bit, 2-Wire Serial ADC

in a 14-Pin TSSOP

16

______________________________________________________________________________________

Figure 11. Read Cycle

S

1

SLAVE ADDRESS

71

R

NUMBER OF BITS

P OR Sr

1

1

8

RESULT #1

A

18

RESULT #1

A

1

8

RESULT

A

18

RESULT

A

1

CLOCK STRETCH

A

8

RESULT #2

A

1

CLOCK STRETCH

NUMBER OF BITS

89

567

BIT3

BIT2

BIT1

BIT0

A

CLOCK STRETCH

SCL

SDA

12

3

D10

D12

D11

8

RESULT #2

A

1

NUMBER OF BITS

P OR Sr

1

A

1

8

RESULT #N

A

18

RESULT #N

CLOCK STRETCH

(MOST SIGNIFICANT BYTE) (LEAST SIGNIFICANT BYTE)

(MOST SIGNIFICANT BYTE) (LEAST SIGNIFICANT BYTE)

(LEAST SIGNIFICANT BYTE)

(MOST SIGNIFICANT BYTE)

(MOST SIGNIFICANT BYTE) (LEAST SIGNIFICANT BYTE)

ANALOG INPUT

TRACK AND HOLD

TRACK

HOLD

HOLD

B. CONTINUOUS CONVERSIONS

A. SINGLE CONVERSION

SLAVE TO MASTER

MASTER TO SLAVE

C. ACQUISITION DETAIL

D13

4

R

S

1

SLAVE ADDRESS

A

71 1

CLOCK STRETCH