MAX7316AEE+ Maxim Integrated Products, MAX7316AEE+ Datasheet - Page 16

• Manufacturer Part Number: MAX7316AEE+
• Description: IC I/O EXPANDER I2C 16B 16QSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX7316AEE+

• Interface: I²C, SMBus
• Number Of I /o: 10
• Interrupt Output: Yes
• Frequency - Clock: 400kHz
• Voltage - Supply: 2 V ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

When blink is enabled (Table 7), the blink phase 0 regis-
ter and blink phase 1 register specify each output’s logic
level during the PWM on-time during the respective blink
phases (Tables 8 and 9). The effect of setting an output’s
blink phase x register bit to 0 or 1 is shown in Table 12.
LEDs can be flipped between either directly on and off,
or between a variety of high/low PWM intensities.
The 4 bits used for output O8’s PWM individual intensity
setting also double as the global intensity control (Table
13). Global intensity simplifies the PWM settings when
the application requires them all to be the same, such
as for backlight applications, by replacing the 9 individ-
ual settings with 1 setting. Global intensity is enabled
with the Global Intensity flag G in the configuration reg-
ister (Table 4). When global PWM control is used, the 4
bits of master intensity and 4 bits of O8 intensity effec-
tively combine to provide an 8-bit, 240-step intensity
control applying to all outputs.
It is not possible to apply global PWM control to a sub-
set of the ports, and use the others as logic outputs. To
mix static logic outputs and PWM outputs, individual
PWM control must be selected (Table 10).
10-Port I/O Expander with LED Intensity
Control, Interrupt, and Hot-Insertion Protection
Table 8. Blink Phase 0 Register
Table 9. Blink Phase 1 Register
16
Using PWM Intensity Controls with Blink Enabled
______________________________________________________________________________________
Read back outputs phase 0
Read back outputs phase 1
Write outputs phase 0
Write outputs phase 1
REGISTER
REGISTER
Global/O8 Intensity Control
R/W
R/W
0
1
0
1
ADDRESS
ADDRESS
CODE
CODE
(HEX)
(HEX)
0x0A
0x02
OP7
OP7
D7
D7
I/O ports P0-P7, interrupt output INT/O8, RST input,
BLINK input, and serial interface SDA, SCL, AD0 remain
high impedance with up to 6V asserted on them when
the MAX7316 is powered down (V+ =0V). The MAX7316
can therefore be used in hot-swap applications.
The open-drain output architecture allows the ports to
level translate the outputs to higher or lower voltages
than the MAX7316 supply. An external pullup resistor
can be used on any output to convert the high-imped-
ance logic-high condition to a positive voltage level.
The resistor can be connected to any voltage up to
5.5V. For interfacing CMOS inputs, a pullup resistor
value of 220kΩ is a good starting point. Use a lower
resistance to improve noise immunity, in applications
where power consumption is less critical, or where a
faster rise time is needed for a given capacitive load.
OP6
OP6
D6
D6
OP5
OP5
D5
D5
Applications Information
REGISTER DATA
REGISTER DATA
OP4
OP4
D4
D4
Output Level Translation
OP3
OP3
D3
D3
OP2
OP2
D2
D2
Hot Insertion
OP1
OP1
D1
D1
OP0
OP0
D0
D0