AD5522JSVDZ datasheet(55/65 Pages) AD

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AD5522

Data Sheet

Rev. E | Page 54 of 64

READBACK OF SYSTEM CONTROL REGISTER

The system control register readback function is a 24-bit word. Mode and system control register data bits are shown in Table 31.

Table 31. System Control Register Readback

Bit

Bit Name

Description

23 (MSB)

MODE1

Set the MODE1 and MODE0 bits to 0 to address the system control register.

MODE0

System Control Register-Specific Readback Bits

CL3

Read back the status of the individual current clamp enable bits.

0 = clamp is disabled.

1 = clamp is enabled.

When reading back information about the status of the clamp enable function, the data that was most

recently written to the current clamp register from either the system control register or the PMU register

is available in the readback word.

CL2

CL1

CL0

CPOLH3

Read back information about the status of the comparator output enable bits.

1 = PMU comparator output is enabled.

0 = PMU comparator output is disabled.

When reading back information about the status of the comparator output enable function, the data

that was most recently written to the comparator status register from either the system control register

or the PMU register is available in the readback word.

CPOLH2

CPOLH1

CPOLH0

CPBIASEN

This readback bit indicates the status of the comparator enable function.

1 = comparator function is enabled.

0 = comparator function is disabled.

DUTGND/CH

DUTGND per channel enable.

1 = DUTGND per channel is enabled.

0 = individual guard inputs are available per channel.

GUARD ALM

These bits provide information about which of these alarm bits trigger the CGALM pin.

1 = guard/clamp alarm is enabled.

0 = guard/clamp alarm is disabled.

CLAMP ALM

INT10K

If this bit is high, the internal 10 kΩ resistor (SW7) is connected between FOHx and MEASVHx, and

between DUTGND and AGND. If this bit is low, SW7 is open.

Guard EN

Read back the status of the guard amplifiers. If this bit is high, the amplifiers are enabled.

GAIN1

Status of the selected MEASOUTx output range. See Table 10 and Table 11.

GAIN0

TMP ENABLE

Read back the status of the thermal shutdown function.

TMP1

Bits[5:3]

Action

TMP0

0XX

Thermal shutdown disabled.

100

Thermal shutdown enabled at junction temperature of 130°C (power-on default).

101

Thermal shutdown enabled at junction temperature of 120°C.

110

Thermal shutdown enabled at junction temperature of 110°C.

111

Thermal shutdown enabled at junction temperature of 100°C.

1XX

Thermal shutdown enabled.

Latched

This bit indicates the status of the open-drain alarm outputs, TMPALM and CGALM.

1 = open-drain alarm outputs are latched.

0 = open-drain alarm outputs are unlatched.

Unused

readback bits

Loads with 0s.

0 (LSB)

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