73S1209F Maxim, 73S1209F Datasheet - Page 102

• Manufacturer Part Number: 73S1209F
• Description: The 73S1209F is a self-contained, SoC smart card reader IC that is an ideal solution for serially connected ISO 7816 design
• Manufacturer: Maxim

register configures the V
The user’s code may load a different value using the FOVRVDDF bit =1 after the power-up cycle has
completed
VDDFault Control Register (VDDFCtl): 0xFFD4
MSB
73S1209F has the capability to burn fuses at the factory to set the factory default to any of these
voltages. Contact Teridian for further details.
1.7.14 VDD Fault Detect Function
The 73S1209F contains a circuit to detect a low-voltage condition on the supply voltage V
it will deactivate the active internal smart card interface when V
* Note: The V
102
VDDFCtl.7
VDDFCtl.6
VDDFCtl.5
VDDFCtl.4
VDDFCtl.3
VDDFCtl.2
VDDFCtl.1
VDDFCtl.0
–
Bit
FOVRVDDF VDDFLTEN
DD
FOVRVDDF
VDDFLTEN Set = 1 will disable VDD Fault operation.
VDDFTH.2
VDDFTH.1
VDDFTH.0
Fault factory default can be set to any threshold as defined by bits VDDFTH(2:0). The
Symbol
–
–
–
DD
Fault threshold for the nominal default of 2.3V* or a user selectable threshold.
Setting this bit high will allow the VDDFLT(2:0) bits set in this register to
control the VDDFault threshold. When this bit is set low, the VDDFault
threshold will be set to the factory default setting of 2.3V*.
VDD Fault Threshold.
Bit value(2:0)
000
001
010
011
100
101
110
111
Table 109: The VDDFCtl Register
–
VDDFault voltage
2.3 (nominal default)
2.4
2.5
2.6
2.7
2.8
2.9
3.0
0x00
STXDAT.3 VDDFTH.2 VDDFTH.1 VDDFTH.0
Function
DD
falls below the V
DD
Fault threshold. The
DD
. If enabled,
Rev. 1.2
LSB