MAX8688ALETG+ Maxim Integrated Products, MAX8688ALETG+ Datasheet - Page 23

• Manufacturer Part Number: MAX8688ALETG+
• Description: IC PWR SUPPLY CTRLR/MONTR 24TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX8688ALETG+

• 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 SMBus interface does not support pack-
et error checking (PEC). It does not support the 35ms
timeout either. Therefore, to reset the MAX8688 SMBus
interface, the host controller has to hold RST low for
t
Operation section.
The MAX8688 supports a subset of the commands
defined in the Power System Management Protocol
Specification Part II - Command Language Revision
1.0. For detailed specifications and the complete list of
PMBus commands, refer to Part II of the PMBus specifi-
cation available at www.PMBus.org. The supported
PMBus commands and the corresponding MAX8688
behavior are described in this document.
All data values are represented in DIRECT format,
unless otherwise stated. Whenever the resolution of the
data is less than the number of bits required, data are
right justified (only the lower bits are significant) and
the higher order bits are zero-padded, unless otherwise
Table 4. MAX8688 PMBus Command Summary
SMB_RST
10
11
12
13
14
15
16
17
1
2
3
4
5
6
7
8
9
. This resets the SMBus interface. See the RST
COMMAND
CODE
4Ah
01h
03h
11h
12h
21h
25h
26h
27h
29h
38h
40h
42h
43h
44h
46h
4Fh
______________________________________________________________________________________
Digital Power-Supply Controller/Monitor
PMBus Protocol Support
OPERATION
CLEAR_FAULTS
STORE_DEFAULT_ALL
RESTORE_DEFAULT_ALL
VOUT_COMMAND
VOUT_MARGIN_HIGH
VOUT_MARGIN_LOW
VOUT_TRANSITION_RATE
VOUT_SCALE_LOOP
IOUT_SCALE
VOUT_OV_FAULT_LIMIT
VOUT_OV_WARN_LIMIT
VOUT_UV_WARN_LIMIT
VOUT_UV_FAULT_LIMIT
IOUT_OC_FAULT_LIMIT
IOUT_OC_WARN_LIMIT
OT_FAULT_LIMIT
COMMAND NAME
TRANSACTION
stated. For example, for a 2-byte value where the
MAX8688 only has 12-bit data to return, the MAX8688
returns data in the lower 12 bits and zero-padded the
upper 4 bits. Whenever the PMBus specification refers
to the “PMBus device,” it is referring to MAX8688 oper-
ating in conjuction with a POL device. While the com-
mand may call for turning on or off the PMBus device,
the MAX8688 always remains on to continue communi-
cating with the PMBus master and the MAX8688 trans-
fers the command to the POL device accordingly.
Voltage data for commanding or reading the output
voltage or related parameters (such as the overvoltage
threshold) are presented in DIRECT format. DIRECT
format data is a 2-byte, two’s complement binary value.
DIRECT format data may be used with any command
that sends or reads a parametric value. The DIRECT
format uses an equation and defined coefficients to cal-
culate the desired values. The coefficients used by the
MAX8688 can be found in Table 4.
Send Byte
Send Byte
Send Byte
R/W Word
R/W Word
R/W Word
R/W Word
R/W Word
R/W Word
R/W Word
R/W Word
R/W Word
R/W Word
R/W Word
R/W Word
R/W Word
R/W Byte
with PMBus Interface
TYPE
NO. OF
BYTES
1
0
0
0
2
2
2
2
2
2
2
2
2
2
2
2
2
19995
19995
19995
19995
19995
19995
19995
23109
23109
-7612
256
128
—
—
—
—
m
1
Data Format
335
—
—
—
—
b
0
0
0
0
0
0
0
0
0
0
0
0
—
—
—
—
-1
-1
-1
-1
-1
-1
-1
-2
-2
-3
R
0
0
1
23