73S1217F-68MR/F/PE Maxim Integrated, 73S1217F-68MR/F/PE Datasheet - Page 28
![no-image](/images/no-image-200.jpg)
73S1217F-68MR/F/PE
Manufacturer Part Number
73S1217F-68MR/F/PE
Description
8-bit Microcontrollers - MCU
Manufacturer
Maxim Integrated
Datasheet
1.73S1217F-68MRFPE.pdf
(140 pages)
Specifications of 73S1217F-68MR/F/PE
Rohs
yes
Core
80515
Data Bus Width
8 bit
Part # Aliases
90-W1217+TF5
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logic and companion circuits. The default state upon application of power is the “OFF” state unless
power is supplied to the V
Note: When the ON_OFF switch function is not needed, i.e. when the 73S1217F must be in an always-
ON state when using another supply than VBUS (V
disabling the clock going to the block. The miscellaneous control registers MISCtl0,
acknowledge this request by setting the SCPWRDN bit in the Smart Card V
(VccCtl) high after it has completed all shutdown activities. When SCPWRDN is set high, the circuit will
deactivate the smart card interface if required and turn off all analog functions and the V
73S1217F will go into the “OFF” state (when V
desired and the application does not need to shut down power on VDD, the ON_OFF input can be
permanently grounded which will automatically turn on VDD when power is supplied on any of the VPC,
VBAT or VBUS power supply inputs.
If power is applied to both V
source. The 73S1217F will be unconditionally “ON” when V
the 73S1217F will switchover to the VBAT input supply and remain in the “ON” state. The firmware
should assert SCPWRDN based on no activity or V
When operating from V
connecting V
state. The USB “SUSPEND” state requires the power supply current to be less than 500uA. In order to
obtain and meet this low current limitation, the firmware must configure the 73S1217F into a power-down
condition using less than 20uA from V
needed.
1.7.4
The 73S1217F contains circuitry to disable portions of the device and place it into a lower power standby
mode or power down the 73S1217F into its “OFF” mode. The standby mode will stop the core, clock
subsystem and the peripherals connected to it. This is accomplished by either shutting off the power or
Master Clock Control register (MCLKCtl) provide control over the power modes. The PWRDN bit in
MISCtl0
ON/OFF circuitry and power applied to the VBUS input, the 73S1217F will go into either standby mode or
power “OFF” mode. If system power is provided by, VBUS or the ON/OFF circuitry is in the “ON” state,
the MPU core will placed into standby mode. If the VBUS input is not sourcing power and the ON/OFF
circuitry is in the “OFF” state, setting the PWRDN bit will shut down the converter and VP will turn off.
This in turn will turn off the VDD supply and the 73S1217F will be turned “OFF”. The power down modes
should only be initiated by setting the PWRDN bit in the
individual control bits in various registers. Figure 6 shows how the PWRDN bit controls the various
functions that comprise power down state
28
Power Control Modes
will set up the 73S1217F for either standby or “OFF” modes. Depending on the state of the
BUS
to V
P
in order to save power. This condition is appropriate for the USB “SUSPEND”
BUS
BUS
, and not calling for V
BAT
supply. Note that at any time, the firmware may assert SCPWRDN and the
and V
BUS
DD
.
, the circuit will automatically consume power from only the V
BUS
CC
, the step-up converter becomes a simple switch
is not present). If the OFF switch function is not
BUS
PC
or V
removal to reduce battery power consumption.
MISCtl0
BAT
BUS
), some external discrete components are
is applied. If the V
register and not by manipulating
CC
Control/Status Register
BUS
MISCtl1
source is removed,
DD
supply for the
and the
Rev. 1.2
BUS
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