MAX11612 Datasheet, PDF (12/22 Pages) Maxim Integrated Products – 2.7V to 3.6V and 4.5V to 5.5V, Low-Power, 4-/8-/12-Channel, 2-Wire Serial, 12-Bit ADCs

2.7V to 3.6V and 4.5V to 5.5V, Low-Power,
4-/8-/12-Channel, 2-Wire Serial, 12-Bit ADCs
Slave Address
A bus master initiates communication with a slave device
by issuing a START condition followed by a slave
address. When idle, the MAX11612–MAX11617 continu-
ously wait for a START condition followed by their slave
address. When the MAX11612–MAX11617 recognize
their slave address, they are ready to accept or send
data. See the Ordering Information for the factory pro-
grammed slave address of the selected device. The
least significant bit (LSB) of the address byte (R/W)
determines whether the master is writing to or reading
from the MAX11612–MAX11617 (R/W = 0 selects a write
condition, R/W = 1 selects a read condition). After
receiving the address, the MAX11612–MAX11617
(slave) issues an acknowledge by pulling SDA low for
one clock cycle.
Bus Timing
At power-up, the MAX11612–MAX11617 bus timing is
set for fast-mode (F/S mode), which allows conversion
rates up to 22.2ksps. The MAX11612–MAX11617 must
operate in high-speed mode (HS mode) to achieve con-
version rates up to 94.4ksps. Figure 1 shows the bus tim-
ing for the MAX11612–MAX11617’s 2-wire interface.
HS Mode
At power-up, the MAX11612–MAX11617 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 success-
fully receiving the HS-mode master code, the
MAX11612–MAX11617 issue a not-acknowledge, allow-
ing SDA to be pulled high for one clock cycle (Figure 8).
After the not-acknowledge, the MAX11612–MAX11617
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 generates a
STOP condition, the MAX11612–MAX11617 return to
F/S mode.
MAX11612/MAX11613
SLAVE ADDRESS
S
0
1
1
0
1
0
0
R/W
A
SDA
SCL
1
2
3
4
5
6
7
8
9
SEE ORDERING INFORMATION FOR SLAVE ADDRESS OPTIONS AND DETAILS.
Figure 7. MAX11612/MAX11613 Slave Address Byte
HS-MODE MASTER CODE
S
0
0
0
0
1
X
X
X
A
Sr
SDA
SCL
F/S MODE
HS MODE
Figure 8. F/S-Mode to HS-Mode Transfer
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