参数资料
型号: 73S1209F-44MR/F/PD
厂商: Maxim Integrated
文件页数: 5/123页
文件大小: 0K
描述: IC SOC SMART CARD READER 44QFN
标准包装: 2,500
系列: *
73S1209F Data Sheet
DS_1209F_004
102
Rev. 1.2
1.7.14 VDD Fault Detect Function
The 73S1209F contains a circuit to detect a low-voltage condition on the supply voltage VDD. If enabled,
it will deactivate the active internal smart card interface when VDD falls below the VDD Fault threshold. The
register configures the VDD Fault threshold for the nominal default of 2.3V* or a user selectable threshold.
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
0x00
Table 109: The VDDFCtl Register
MSB
LSB
FOVRVDDF VDDFLTEN
STXDAT.3 VDDFTH.2 VDDFTH.1 VDDFTH.0
Bit
Symbol
Function
VDDFCtl.7
VDDFCtl.6
FOVRVDDF
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*.
VDDFCtl.5
VDDFLTEN Set = 1 will disable VDD Fault operation.
VDDFCtl.4
VDDFCtl.3
VDDFCtl.2
VDDFTH.2
VDD Fault Threshold.
Bit value(2:0)
VDDFault voltage
000
2.3 (nominal default)
001
2.4
010
2.5
011
2.6
100
2.7
101
2.8
110
2.9
111
3.0
VDDFCtl.1
VDDFTH.1
VDDFCtl.0
VDDFTH.0
* Note: The VDD Fault factory default can be set to any threshold as defined by bits VDDFTH(2:0). The
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.
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