MAX14578E Datasheet, PDF (20/23 Pages) Maxim Integrated Products – USB Battery Charger Detectors

USB Battery Charger Detectors
ADDRESS = 0x58
0 = WRITE
REGISTER ADDRESS = 0x01
S
0
1
0
1
1
0
0
0
A
ADDRESS = 0x59
1 = READ
0
0
0
0
0
0
0
1 A/N
P
REGISTER 0x00 READ DATA
S
01011001A
d7 d6 d5 d4 d3 d2 d1 d0 A/N
P
Figure 11. Format for Reads (Repeated START)
Table 4. CE_ Outputs for Different Charger Control
SUS_LOW = 0
SUS_LOW = 1
() MAX14578AE only.
CE_
OUTPUTS
(CE0)
CE1
CE2
CE_
OUTPUTS
(CE0)
CE1
CE2
OFF
1
1
1
OFF
1
0
0
100mA
0
0
0
100mA
0
0
0
500mA
0
0
1
500mA
0
0
1
ISET
0
1
0
ISET
0
1
0
MAX8606,
MAX8856
—
EN1
EN2
MAX8934,
MAX8677
USUS
PEN1
PEN2
MAX8814,
MAX8845
EN
—
—
MAX8903
USUS
DCM
IUSB
Applications Information
Charger Control
The MAX14578E charger-enable control outputs are
ideal for autonomous external charger control. Table 4
shows example connections for various Maxim chargers.
Hi-Speed USB
Hi-Speed USB requires careful PCB layout with 45I
single-ended/90I differential controlled-impedance
matched traces of equal lengths.
Power-Supply Bypassing
Bypass VB and BAT with 1FF ceramic capacitors to GND
as close as possible to the device.
Choosing I²C Pullup Resistors
I²C requires pullup resistors to provide a logic-high level
to data and clock lines. There are trade-offs between
power dissipation and speed, and a compromise must
be made in choosing pullup resistor values. Every device
connected to the bus introduces some capacitance even
when device is not in operation. I²C specifies 300ns rise
times to go from low to high (30% to 70%) for fast-mode,
which is defined for a clock frequency up to 400kHz (see
the I²C Serial Interface (MAX14578E) section for details).
To meet the rise time requirement, choose pullup resis-
tors so that tR = 0.85 x RPULLUP x CBUS < 300ns. If the
transition time becomes too slow, the setup and hold
times may not be met and waveforms may not be rec-
ognized.
Extended ESD Protection
ESD-protection structures are incorporated on all pins
to protect against electrostatic discharges up to ±2kV
(Human Body Model) encountered during handling and
assembly. The CD- and CD+ pins are further protected
against ESD up to ±15kV (Human Body Model) and
Q8kV IEC 61000-4-2 Contact Discharge without damage.
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