L9960T datasheet(36/95 Pages) STMICROELECTRONICS

36 / 95 page

Functional description

L9960, L9960T

36/95

DS11115 Rev 10

Status of the SPI register (IN1_IN2_if) and its internally latched version are available

through SPI (configuration request 2: “(IN1_IN2_if)” echo and "IN1_IN2_if_latched_echo")

Figure 16. Bridge STATE diagram in IN1/IN2 mode

4.5.2

Disable inputs DIS and NDIS

The pin DIS is internally pulled-up and high active.

When DIS is active (set to HIGH), the bridge is set to disabled independently from the

internal clock (asynchronous switch-off path), whatever the state of the DIR and PWM

inputs. All the data stored in SPI registers are not reset and SPI communication with the

MCU is still possible.

When DIS is inactive (set to LOW) and NDIS is active (set to HIGH), the bridge is controlled

by the DIR and PWM inputs, synchronously. After DIS or NDIS release, the bridge waits for

the next PWM rising edge before being released from disable (see Note).

The pin NDIS is internally pulled down and high active.

When NDIS is inactive (set to LOW) either by NDIS pin or by protection schemes, the bridge

is set disabled independently from the internal clock (asynchronous switch-off path),

whatever the state of the DIR and PWM inputs. All the data stored in SPI registers are not

reset and SPI communication with the MCU is still possible.

The “real-time” state of the bridge is a bit called "BRIDGE_EN". It reflects the disabling of

the bridge, (including disabling by internal protection schemes), and not the tri-state linked

to VVL mode activation.

Note:

In case of IN1/IN2 mode, a rising edge either on IN1 or on IN2 is valid to release the disable

mode. A minimum delay of 1us is suggested to be applied between DIS fall edge and rising

edge on driving control pins.

IN1 IN2 MODE

N DIS

DIS

PWM (IN1)

DIR (IN2)

HS Free

Wheeling

LS Free

Wheeling

HS Free

Wheeling

Reverse

Forward

GAPGPS02322

Table 37. BRIDGE_EN

Bit status

Description

Condition

Bridge disabled

Default value

Bridge Enabled

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