ZAMC4100GA2R datasheet(63/156 Pages) RENESAS

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ZAMC4100 Datasheet

January 26, 2016

3.8.3.

Half-Bridge Driver Output Diagnostic Check

Each half-bridge driver has dedicated diagnostic circuitry that is able to detect open/short failures in the output

load. The HB driver diagnostic circuitry is controlled by the HBDDIAG register (Table 3.17 and Table 3.18), and

the diagnostic flags are monitored by reading register HBDSTAT.

Table 3.19 gives the meaning of the corresponding HBxOSF flags in the HBDSTAT register with respect to the

load configuration and the combination of the HBxCSHEN and HBxCSLEN bits of HBDDIAG register, which

controls the diagnostic current sources/sinks.

Important note: When the diagnostic circuitry is enabled (one of the HBxCSHEN bits or the HBxCSLEN bits is

set), then the corresponding over-current protection circuitry is not active. Therefore, enabling the driver when the

diagnostic circuitry is enabled is not recommended!

Table 3.17 HBDDIAG Register Bits Mapping

Name

HBDDIAG

Bit No

Bit name

Reset

Access

R/W

Address

0x07

R/W = Read/Write bit

Table 3.18 HBDDIAG Register Bits Description

Bit

Description

7,5,3,1

HBxCSHEN:

1), 2) High-side current source enable bit for driver x, (x = 4 to 1, for HB4 to HB1 respectively).

1 = The high-side current source of driver x is enabled.

0 = The high-side current source of driver x is disabled.

6,4,2,0

HBxCSLEN:

1), 2) Low-side current source enable bit for driver x, (x = 4 to 1, for HB4 to HB1 respectively).

1 = The low-side current source of driver x is enabled.

0 = The low-side current source of driver x is disabled.

In order to keep current consumption as low as possible, the MCU software should disable the current sources before enabling the

SLEEP or STANDBY Modes.

In the event of an over-temperature event, these current sources are automatically disabled.

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