CD1030 datasheet(21/67 Pages) NXP

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Analog Integrated Circuit Device Data

NXP Semiconductors

CD1030

General IC functional description

The CD1030 device interacts with many connections outside the module and near the end user. The IC detects changes in switch state

and reports the information to the MCU via the SPI protocol. The input pins generally connected to switches located outside the module

and in proximity to battery in car harnesses. Consequently, the IC must have some external protection including an ESD capacitor and

series resistors, to ensure the energy from the various pulses are limited at the IC.

The IC requires a blocking diode be used on the VBATP pin to protect from a reverse battery condition. The inputs are capable of surviving

reverse battery without a blocking diode and also contain an internal blocking diode from the input to the power supply (VBATP). This

ensures there is no back feeding of voltage/current into the IC, when the voltage on the input is higher than the VBATP pin.

6.1

Battery voltage ranges

The CD1030 device operates from 4.5 V ≤ VBATP ≤ 36 V and is capable of withstanding up to 40 V. The IC operates functionally from

4.5 V < VBATP < 6.0 V, but with degraded parametrics values. Voltages in excess of 40 V must be clamped externally to protect the IC

from destruction. The VBATP pin must be isolated from the main battery node by a diode.

6.1.1

Load dump (overvoltage)

During load dump the CD1030 operates properly up to the VBATP overvoltage. Voltages greater than load dump (~32 V) causes the

current sources to be limited to ~2.0 mA, but the register values are maintained. Upon leaving this overvoltage condition, the original setup

is returned and normal operation begins again.

6.1.2

Jump start (double battery)

During a jump start (double battery) condition, the device must functions normally and meets all the specified parametric values. No

internal faults are set and no abnormal operation noted as a result of operating in this range.

6.1.3

Normal battery range

The normal voltage range is fully functional with all parametrics in the given specification.

6.1.4

Low voltage range (degraded parametrics)

In the VBATP range between 4.5 V to 6.0 V the CD1030 functions normally, but has some degraded parametric values. The SPI functions

normally with no false reporting. The degraded parameters are noted in Table 7 and Table 8. During this condition, the input comparator

threshold is reduced from 4.0 V and remain ratiometrically adjusted, according to the battery level.

6.1.5

Undervoltage lockout

During undervoltage lockout, the MISO output is tri-stated to avoid any data from being transmitted from the CD1030. Any CS_B pulses

are ignored in this voltage range. If the battery enters this range at any point (even during a SPI word), the CD1030 ignores the word and

enters lockout mode. A SPI bit register is available to notify the MCU the CD1030 has seen an undervoltage lockout condition, once the

battery is high enough to leave this range. During this mode, the input comparator and current sources are turned off.

6.1.6

Power On Reset (POR) activated

The Power on Reset is activated when the VBATP is within the 2.7 V to 3.8 V range. The CD1030 is initialized in undervoltage lockout

after the POR is de-asserted. A SPI bit in the device configuration register is used to note a POR occurrence, all SPI registers are reset

to the default values, and SPI operation is disabled.

6.1.7

No operation

The device does not function and no switch detection is possible.

CD1030 Datasheet(PDF) 21 Page - NXP Semiconductors

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