73s1217f68im Maxim Integrated Products, Inc., 73s1217f68im Datasheet - Page 57

• Manufacturer Part Number: 73s1217f68im
• Description: Bus-powered 80515 System-on-chip With Usb, Iso 7816 / Emv, Pinpad And More
• Manufacturer: Maxim Integrated Products, Inc.

generated when modifying the threshold. The comparator has a built-in hysteresis to prevent the
comparator from repeatedly responding to low-amplitude noise. This hysteresis is approximately 20mV.
The maximum voltage on the ANA_IN pad should be less than 3 volts. An external resistor divider is
required for detecting voltages greater than 3.0 volts. Interrupt control is handled in the
Analog Compare Control Register (ACOMP): 0xFFD0
1.7.11 Analog Voltage Comparator
The 73S1217F includes a programmable comparator that is connected to the ANA_IN pin. The
comparator can be configured to trigger an interrupt if the input voltage rises above or falls below a
selectable threshold voltage. The comparator control register should not be modified when the analog
interrupt (ANAIEN bit in the
Rev. 1.2
ACOMP.7
ACOMP.6
ACOMP.5
ACOMP.4
ACOMP.3
ACOMP.2
ACOMP.1
ACOMP.0
Bit
MSB
ANALVL
ANALVL
ONCHG
CMPEN
Symbol
TSEL.1
TSEL.0
CPOL
–
0
–
INT6Ctl
When read, indicates whether the input level is above or below the
threshold. This is a real time value and is not latched, so it may change
from the time of the interrupt trigger until read.
If set, the Ana_interrupt is invoked on any change above or below the
threshold, bit 4 is ignored.
If set = 1, Ana_interrupt is invoked when signal rises above selected
threshold. If set = 0, Ana_interrupt is invoked when signal goes below
selected threshold (default).
Enables power to the analog comparator. 1= Enabled. 0 = Disabled
(default).
This value must be fixed at 0.
Sets the voltage threshold for comparison to the voltage on pin ANA_IN.
Thresholds are as follows:
00 = 1.00V
01 = 1.24V
10 = 1.40V
11 = 1.50V
ONCHG
register) is enabled to guard against any false interrupt that might be
Table 59: The ACOMP Register
CPOL
CMPEN
0x00
Function
0
TSEL.1 TSEL.0
LSB
INT6Ctl
register.
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