Rainbow Electronics MAX1364 - Manual (Page 13)

unsuccessful data transfers. An unsuccessful data trans-
fer happens if a receiving device is busy or if a system
fault has occurred. In the event of an unsuccessful data
transfer, the bus master reattempts communication at a
later time.
Slave Address
The MAX1363/MAX1364 have a 7-bit I 2 C slave
address. The slave address is selected using A0. The
MAX1363/MAX1364 (EUB, MEUB, and LEUB) have
three base address options, allowing up to six devices
concurrently per I
2 C bus (see Table 1).
The MAX1363/MAX1364 continuously wait for a START
condition followed by its slave address. When the device
recognizes its slave address, it is ready to accept or
send data depending on the R/W bit (Figure 6).
HS I 2 C Mode
At power-up, the MAX1363/MAX1364 bus timing is set
for fast mode (F/S mode, up to 400kHz I
2 C clock), which
limits the conversion rate to approximately 22ksps.
Switch to high-speed mode (HS mode, up to 1.7MHz
I
2 C clock) to achieve conversion rates up to 94.4ksps.
The MAX1363/MAX1364 convert up to 133ksps in moni-
tor mode, regardless of I
2 C mode. If conversion results
are unread, I 2 C bandwidth limitations do not apply (see
the Monitor Mode section).
Select HS mode by addressing all devices on the bus
with the HS-mode master code 0000 1XXX (X = don’t
care). After successfully receiving the HS-mode master
code, the MAX1363/MAX1364 issue a NACK, allowing
SDA to be pulled high for one clock cycle (Figure 7).
After the NACK, the MAX1363/MAX1364 operate in HS
mode. Send a repeated START (Sr) followed by a slave
address to initiate HS-mode communication. If the mas-
ter generates a STOP condition, the MAX1363/
MAX1364 return to F/S mode. Use a repeated START
condition (Sr) in place of a STOP condition to leave the
bus active and the mode unchanged.
MAX1363/MAX1364
4-Channel, 12-Bit System Monitors with Programmable
Trip Window and SMBus Alert Response
______________________________________________________________________________________ 13
0 1 1 1 0 0 0 R/W ACK
SLAVE ADDRESS
S
SCL
SDA
1 2 3 4 5 6 7 8 9
Figure 6. MAX1363/MAX1364 Slave Address Byte
A0 STATE SUFFIX ADDRESS
Low EUB 0110100
High EUB 0110101
Low LEUB 0110010
High LEUB 0110011
Low MEUB 0110110
High MEUB 0110111
Table 1. I 2 C Slave Selection Table
0 0 0 1 0 X X X NACK
HS-MODE MASTER CODE
SCL
SDA
S Sr
F/S MODE HS MODE
Figure 7. F/S-Mode to HS-Mode Transfer