MAX14600_12 Datasheet, PDF (13/16 Pages) Maxim Integrated Products – USB Host Charger Identification/Adapter Emulators

MAX14600–MAX14605/MAX14618
USB Host Charger Identification/Adapter Emulators
USB
VCC
TRANSCEIVER
TDM TDP
0.1µF
TDM TDP
DP
DM
MAX14601
MAX14604
MAX14618
CEN
CB0
GND ^CB1
GND
D+
USB
CONNECTION
D-
V_BUS
150µF
VBUS
33kΩ
1kΩ
CURRENT-LIMIT
SWITCH
EN
VCC
+5V POWER
SUPPLY
PM/AM
CM/FM
PS EN
SYSTEM CONTROL
Figure 5. MAX14601/MAX14604/MAX14618 Peripheral Reset Applications Diagram
Table 4. Different Power States
STATE
S0
S1
S2
S3
S4
S5
System on.
DESCRIPTION
Power to the CPU(s) and RAM is maintained;
devices that do not indicate they must remain on
can be powered down.
CPU is powered off.
Standby (suspend to RAM). System memory
context is maintained, and all other system
context is lost.
Hibernate. Platform context is maintained.
Soft off.
USB Pass-Through Mode
with CDP Emulation
The MAX14600–MAX14605/MAX14618 family features
a pass-through mode with CDP emulation. This is to
support the higher charging current capability dur-
ing the pass-through mode in normal USB operation
(S0 state). The peripheral device equipped with CDP
detection capability could draw a charging current as
defined in USB Battery Charger Specification 1.2 when
the charging host supports the CDP mode. This is a
useful feature since most host USB transceivers do
not have the CDP function. Table 4 shows the different
power states of S0–S5.
Bus Voltage Discharge
The MAX14601/MAX14604/MAX14618 auto current-limit
switch-control output can be used to discharge the V_BUS
during V_BUS reset. When the system controls the current
limit switch for V_BUS toggle, the output capacitor can
be discharged slowly depending upon the load. If fast
discharge of the V_BUS is desired, the CEN output can be
used to discharge the V_BUS (Figure 6.)
Data Contact Detect Support
The MAX14600–MAX14605/MAX14618 family support
USB devices that require detecting the USB data lines
prior to charging. When a USB Revision 1.2-compliant
device is attached, the USB data lines DP and DM are
shorted together. The short remains until it is detected
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