MAX8688BHETG+ Maxim Integrated Products, MAX8688BHETG+ Datasheet - Page 19

• Manufacturer Part Number: MAX8688BHETG+
• Description: IC PWR SUPPLY CTRLR/MONTR 24TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX8688BHETG+

• Applications: Power Supply Controller/Monitor
• Voltage - Supply: 3 V ~ 3.6 V
• Current - Supply: 6.7mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-TQFN Exposed Pad
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 3 V
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Input: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

The MAX8688 reads A3:A2:A1 address pins upon device
reset and determines its address according to Table 3.
For example, to configure the MAX8688 to have a slave
address of 010 0101 (25h), set A3:A2:A1 = H:L:Z. The
MAX8688 also responds to the broadcast address
(00h). While it is possible to configure the address pins
such that the resulting address is 00h, the MAX8688
with such address is then only responsive to the broad-
cast address. This may cause undesired results if other
PMBus devices are also present on the same bus.
Therefore, the hardwire address pins option give 3
= 26 address options.
If an EEPROM with valid SIGNATURE bytes is attached
to the MAX8688, the MAX8688 also tries to restore its
slave address from the EEPROM. This overrides the
address set by the address pins. This gives a total of
127 useful slave addresses (address 00h is normally
for broadcast address). If the address bit 7 from the
EEPROM is set to 1, this is an invalid address and the
Figure 10. MAX8688 Address Assignment
RESET
SET SLAVE ADDRESS
______________________________________________________________________________________
MFR_SET_ADDR?
VALID EEPROM?
ACCORDING TO
Digital Power-Supply Controller/Monitor
EEPROM?
SAVE TO
A3:A1
N
N
N
Y
Y
Y
STORE NEW ADDRESS
SAVE NEW ADDRESS
SLAVE ADDRESS
RESTORE SLAVE
ADDRESS FROM
TEMPORARILY.
UNCHANGED.
TO EEPROM
EEPROM
3
- 1
MAX8688 continues using the address set by the
address pins. When an EEPROM is attached to
A2/SDAE and A1/SCLE, these pins assume either a
logic-high or logic-low level, therefore, the resulting
number of possible addresses set by the A3:A2:A1
pins in this scenario is 2
In addition, for the MAX8688 with an EEPROM
attached, the system controller can change the
MAX8688 slave address by sending the new address
with the MFR_SET_ADDRESS command. However, the
new address is not immediately effective. The new
address must be stored to the EEPROM first. Then, a
device reset has to be applied to the MAX8688 which
undergoes the address assignment procedure and
recalls the new address from the EEPROM.
Table 3. MAX8688 A3:A1 Address
Assignment
* The address 00h is reserved for broadcast.
** The shaded addresses are not available if an external EEPROM
is attached.
A3/ONOFF
with PMBus Interface
H
H
H
H
H
H
H
H
H
L
L
L
L
Z
Z
Z
Z
L
L
Z
Z
L
L
Z
Z
L
Z
A2/SDAE
H
H
H
H
H
H
H
H
H
L
L
Z
Z
L
L
Z
Z
L
Z
L
Z
L
L
Z
Z
L
Z
3
- 1 = 7.
A1/SCLE
H
H
H
H
H
H
H
H
H
L
Z
L
Z
L
Z
L
Z
L
Z
L
Z
L
Z
L
Z
L
Z
ADDRESS
01h**
00h*
0Bh
0Dh
1Bh
2Dh
02h
03h
04h
05h
06h
07h
09h
0Fh
12h
13h
16h
17h
1Fh
24h
25h
26h
27h
2Fh
36h
37h
3Fh
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