MAX7314ATG Maxim Integrated Products, MAX7314ATG Datasheet - Page 22

• Manufacturer Part Number: MAX7314ATG
• Description: Communication ICs - Various
• Manufacturer: Maxim Integrated Products
• Type: Hot Insertion Protectionr

Specifications of MAX7314ATG

• Mounting Style: SMD/SMT
• Operating Supply Voltage: 2.5 V, 3.3 V
• Supply Type: Analog
• Package / Case: TQFN-24 EP
• Data Rate: 400 Kbps
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 2 V
• Supply Current: 0.057 mA
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX7314 can be used to drive loads drawing more
than 50mA, like relays and high-current white LEDs, by
paralleling outputs. Use at least one output per 50mA of
load current; for example, a 5V 330mW relay draws
66mA and needs two paralleled outputs to drive it.
Ensure that the paralleled outputs chosen are controlled
by the same blink phase register, i.e., select outputs
from the P0 through P7 range, or the P8 through P15
range. This way, the paralleled outputs are turned on
and off together. Do not use output O16 as part of a
load-sharing design. O16 cannot be switched at the
same time as any of the other outputs because it is con-
trolled by a different register.
18-Port GPIO with LED Intensity Control,
Interrupt, and Hot-Insertion Protection
Table 14. Output Intensity Registers (continued)
22
Driving Load Currents Higher than 50mA
Read back output P11, P10 intensity
Read back output P13, P12 intensity
Read back output P15, P14 intensity
Read back output P9, P8 intensity
______________________________________________________________________________________
OUTPUTS P11, P10 INTENSITY
OUTPUTS P13, P12 INTENSITY
OUTPUTS P15, P14 INTENSITY
OUTPUTS P9, P8 INTENSITY
Write output P11, P10 intensity
Write output P13, P12 intensity
Write output P15, P14 intensity
Write output P9, P8 intensity
OUTPUT O16 INTENSITY
REGISTER
R/W
0
1
0
1
0
1
0
1
ADDRESS
CODE
(hex)
0x14
0x15
0x16
0x17
P11I3
P13I3
P15I3
MSB
MSB
MSB
MSB
P9I3
D7
OUTPUT P11 INTENSITY
OUTPUT P13 INTENSITY
OUTPUT P15 INTENSITY
OUTPUT P9 INTENSITY
The MAX7314 must be protected from the negative
voltage transient generated when switching off induc-
tive loads, such as relays, by connecting a reverse-
biased diode across the inductive load (Figure 19). The
peak current through the diode is the inductive load’s
operating current.
The MAX7314 operates with a power-supply voltage of
2V to 3.6V. Bypass the power supply to GND with at
least 0.047µF as close to the device as possible. For
the QFN version, connect the underside exposed pad
to GND.
P11I2
P13I2
P15I2
P9I2
D6
See master, O16 intensity register (Table 13).
P11I1
P13I1
P15I1
P9I1
D5
REGISTER DATA
Power-Supply Considerations
P11I0
P13I0
P15I0
LSB
P9I0
LSB
LSB
LSB
D4
P10I3
P12I3
P14I3
MSB
MSB
MSB
MSB
P8I3
D3
OUTPUT P10 INTENSITY
OUTPUT P12 INTENSITY
OUTPUT P14 INTENSITY
OUTPUT P8 INTENSITY
P10I2
P12I2
P14I2
P8I2
D2
P10I1
P12I1
P14I1
P8I1
D1
P10I0
P12I0
P14I0
LSB
P8I0
LSB
LSB
LSB
D0