MAX1069 is in HS-mode. The master must then send a

repeated START followed by a slave address to initiate

HS-mode communication. If the master generates a

STOP condition, the MAX1069 returns to F/S-mode.

Data Byte (Read Cycle)

Initiate a read cycle to begin a conversion. A read

cycle begins with the master issuing a START condition

followed by seven address bits and a read bit (R/W).

R/W = 1 to read from a device, however, since the

MAX1069 does not require setup or configuration, the

read mode is inherent and R/W controls power-down

(see the Internal Reference Shutdown section). If the

address byte is successfully received, the MAX1069

(slave) issues an acknowledge and begins conversion.

ing conversion. When the conversion is complete, SCL

is released and the master can clock data out of the

device. The most significant byte of the conversion is

available first and contains D13 to D6. The least signifi-

cant byte contains D5 to D0 plus two trailing sub bits

S1 and S0. Data can be continuously converted as long

as the master acknowledges the conversion results.

Issuing a not acknowledge frees the bus allowing the

master to generate a STOP or repeated START.

Applications Information

Power-On Reset

When power is first applied, internal power-on reset cir-

cuitry activates the MAX1069 in shutdown. When the

internal reference is used, allow 12ms for the reference

Automatic Shutdown

The MAX1069 automatic shutdown reduces the supply

current to less than 0.6µA between conversions. The

When the MAX1069 receives a valid slave address the

device powers up. The device is then powered down

again when the conversion is complete. The automatic

shutdown function does not change with internal or

external reference. When the internal reference is cho-

sen, the internal reference remains active between con-

versions unless internal reference shutdown is requested

(see the Internal Reference Shutdown section).

Internal Reference Shutdown

The R/W bit of the slave address controls the MAX1069

internal reference shutdown. In external reference

reference mode, setting R/W = 1 places the device in

normal operation and setting R/W = 0 prepares the

internal reference for shutdown.

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

in a 14-Pin TSSOP

______________________________________________________________________________________

15

Figure 10. F/S-Mode to HS-Mode Transfer

123

0

0

0

89

45

67

01

X

X

X

Sr

S

F/S-MODE

HS-MODE

SDA

A

Figure 9. MAX1069 Slave Address Byte

SCL

SDA

123

1

1

0

89

45

67

ADD3

ADD2

ADD1

ADD0

R/W

A

ACKNOWLEDGE

S