7

Serial Register Data Sequence

HIP0080, HIP0081The fault data follows the Serial Register

Data Sequence of Table 1 in bit sequence and, in cascade,

by IC sequence. In each of the 4 power switching output

channels, the diagnostic sense circuits set 1-bit in the

parallel diagnostic register for each of the 4 diagnostics

fault conditions. A total of 16 diagnostics data bits are

shifted to the serial register when CS goes low. Table 1

shows the order and sequence of the serial bits as they are

shifted out of DO. The fault action that sets each of the

diagnostics bits for each of the 4 switches is described

below:

HIP0080, HIP0081Bit 1 - indicates a thermal overload

when the sensed junction temperature of the output is

greater than 150oC. When over-temperature is sensed, the

sensor output directly gates-off the drive to the power

output and the respective fault bit is set in the diagnostic

register. When the chip is sufficiently cooled, the output is

gated-on if the input remains ON.

HIP0080, HIP0081Bit 2 - indicates the fault condition for an

output-to-supply short (shorted load). A small value of

resistance (~0.01W) in the source-to-ground line of the

output stage is used to sense the output short. A

comparator senses the voltage level and filters the output

to provide an input to the control stage and to the

diagnostic register. The control state directly shuts down

the output when an over-current condition is sensed. Under

this condition of fault, the input driver is latched off. To

restore the output drive, the short must be removed and the

input toggled OFF and then ON. A short to the supply is the

only error condition that requires an input toggle reset.

HIP0080, HIP0081Bit 3 - indicates the condition of an

output to ground short. As shown in the Functional Block

Diagram, each output stage has drain-to-supply (VCC1)

and drain-to-ground pull-up and pull-down resistors of

approximately 10kW to sense this condition. When the

output is off and the sense level is low, an output-to-ground

short is detected by the comparator. This condition is

sensed when the output is pulled lower than 0.24xVCC

(typical).

HIP0080, HIP0081Bit 4 - indicates the condition of an open

load on the output. The same divider noted for Bit 3 is used

to set the output level. If the sense level is at or near the

the off condition, a no-load condition is detected.

Serial Peripheral Interface Bus Control

HIP0080, HIP0081Technically, the HIP0080 and HIP0081

fault data has only 16 bits. Except for the Error Flag, DF

data bit shown in Figure 2, the format matches that of a

normal CPOL = 0, CPHA=1 SPI protocol (polarities, phase,

etc). The DF bit from the DO output is active only until the

clock starts. The best way to take advantage of it (if

desired) is to connect the DO to the SPI bus, and also to a

port pin, or other logic input. After CS goes low and before

the SPI clocks starts, the DF bit can be read. If it is a zero,

then the rest of the data does not have to be read. (The

data will be all 0's = no errors). If the DF bit = 1, then the

data must be read to find out which bit(s) is set.

HIP0080, HIP0081Mutiple ICs can be cascaded such that

an error bit on any IC will daisy chain up to the last DO; this

allows the microcontroller to "wire-OR" all of the devices

automatically. Other than bidirectional data IC types,

different IC types may be cascaded. The HIP0080 or

HIP0081 should be closest to the microcontroller to use the

DF bit feature. ICs that do not have an OR’ed means of

passing fault bit would require all data be clocked to check

the diagnostic bits.

Clamp Energy Ratings for the HIP0080

and HIP0081

HIP0080, HIP0081Figures 4 and 5 define the Single Pulse

Energy ratings for the HIP0080 and HIP0081. Refer to

Application Note AN9416 for further information on Single

Pulse Energy ratings for inductive load operation and

Dissipation capability for the 15 pin Power SIP Package.

The Device Under Test conducts when the zener over

voltage clamp turns on the output. While drain-to-source

voltage, VDS and and drain current, ID are monitored, the

current drive pulse width, tON in seconds is varied to

determine the Single Pulse Energy capability. The energy

in Joules is calculated from the following equation:

HIP0080, HIP0081Single Pulse Energy = VDS x ID x tON .

HIP0080, HIP0081Refer to Application Note 9416 for

further information on Single Pulse Energy ratings for

inductive load operation and Dissipation capability for the

15 pin Power SIP Package.

TABLE 1. SERIAL REGISTER DATA SEQUENCE

CHANNEL NO.

BIT

NO.

FAULT FUNCTION

FAULT

SYMBOL

Switch

Channel 1

1

Over-Temperature

OT1

2

Short to Supply

SB1

3

Short to Ground

SG1

4

Open Load

OI1

Switch

Channel 2

5

Over-Temperature

OT2

6

Short to Supply

SB2

7

Short to Ground

SG2

8

Open Load

OI2

Switch

Channel 3

9

Over-Temperature

OT3

10

Short to Supply

SB3

11

Short to Ground

SG3

12

Open Load

OI3

Switch

Channel 4

13

Over-Temperature

OT4

14

Short to Supply

SB4

15

Short to Ground

SG4

16

Open Load

OI4

TABLE 1. SERIAL REGISTER DATA SEQUENCE

CHANNEL NO.

BIT

NO.

FAULT FUNCTION

FAULT

SYMBOL

HIP0080, HIP0081