73S1210F-68IM/F Maxim Integrated Products, 73S1210F-68IM/F Datasheet - Page 26

• Manufacturer Part Number: 73S1210F-68IM/F
• Description: IC SMART CARD READER 68-QFN
• Manufacturer: Maxim Integrated Products

Specifications of 73S1210F-68IM/F

• Core Processor: 80515
• Core Size: 8-Bit
• Speed: 24MHz
• Connectivity: I²C, SmartCard, UART/USART
• Peripherals: LED, POR, WDT
• Number Of I /o: 8
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 6.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

73S1210F Data Sheet
V
of 4.0 to 6.5 volts.
V
(break-before-make). They will not be enabled at the same time. V
V
If V
V
The power that is supplied to the V
up-converted to the intermediate voltage V
inductor (nominal value = 10 µH) must be connected from V
capacitor must be connected to V
V
is used internally by the smart card electrical interface circuit and is regulated to the desired smart card
supply V
V
68 and must be directly tied to all other V
digital logic, input/output buffering, and analog functions. It can also be used for external circuitry: up to
20mA current can be supplied to external devices simultaneously to the 73S1210F’s digital core
maximum consumption.
1.7.3
The 73S1210F features an ON_OFF input pin for a momentary contact, main-system ON/OFF switch. The
purpose of this switch is to place the circuit in a very low-power mode – the “OFF” mode – where all circuits
are no longer powered, therefore allowing the lowest possible current consumption.
When in “OFF” mode, an action on the ON/OFF switch will turn-on the power supply of the digital core
(V
requires firmware action.
When in “ON” mode, an action on the ON/OFF switch will send a request to the controller that will have to
be acknowledged (firmware action required) in order to enter the “OFF” state.
When placed into the “OFF” state, the 73S1210F will consume minimum current from V
and V
When in “ON” mode, the 73S1210F will operate normally, with all the features described in this document
available. V
Whenever V
ON/OFF switch and circuitry are overridden and the 73S1210F is in the “ON” state with V
Without V
The ON_OFF pin should be connected to an SPST switch to ground. If the circuit is OFF and the switch
is closed for a debounce period of 50-100ms, the circuit will go into the “ON” state wherein all functions
are operating in normal fashion. If the circuit is in the “ON” state and the ON/OFF pin is connected to
ground for a period greater than the debounce period, OFF_REQ will be asserted high and held
regardless of the state of ON/OFF. The OFF_REQ signal should be connected to one of the interrupt
pins to signal the CPU core that a request to shutdown has been initiated. The firmware will
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
logic and companion circuits. The default state upon application of power is the “OFF” state unless
power is supplied to the V
26
BAT
BAT
BAT
PC
P
P
DD
requires a 4.7µF filter capacitor and will have a nominal value of 5.5 volts during normal operation. V
is also used internally to generate a 3.3V nominal, regulated power supply V
PC
pin to prevent current flow from V
) and apply a power-on-reset condition. Alternatively, entering the “OFF” mode from the “ON” mode
is expected to be supplied from a battery of three to four series connected cells with a voltage value
and V
when V
DD
is provided and either V
Power ON/OFF
CC
will be unavailable (V
BUS
BUS
voltage (can be programmed for values of 5V, 3V, or 1.8V).
P
BUS
BUS
and V
applied, the circuit is by default in the “OFF” state, and will respond only to the ON_OFF pin.
are internally switched to V
is present (i.e. V
power is supplied, the circuit will be automatically in the “ON” state. The functions of the
DD
will be available (V
BUS
supply. Note that at any time, the firmware may assert SCPWRDN and the
BAT
DD
BUS
out = 0V and V
or V
PC
PC
.
always has the priority).
BAT
pin (externally or internally, i.e. through V
BUS
DD
or V
DD
PC
is also used, the source of V
P
out = 3.3V and V
pins on the 73S1210F (pins 28 and 40). V
by two separate FET switches configured as a SPDT switch
utilizing an inductive, step-up converter. A series power
BUS
P
into the V
= 0V).
PC
PC
P
source.
= 5.5V nominal).
to the pin LIN, and a 10µF low ESR filter
BUS
PC
is automatically selected in lieu of
must be diode isolated from the
CC
Control/Status Register
BAT
DD
. V
or V
DD
BUS
DD
PC
is output on pin
DD
powers all the
P
DS_1210F_001
– see above) is
and V
supply for the
and V
BAT
DD
Rev. 1.4
; V
available.
P
P