TMS570LS0332PZ datasheet(27/110 Pages) TI1

27 / 110 page

TMS570LS0432, TMS570LS0332

www.ti.com

SPNS186B – OCTOBER 2012 – REVISED JUNE 2015

System Information and Electrical Specifications

6.1

Voltage Monitor Characteristics

A voltage monitor is implemented on this device. The purpose of this voltage monitor is to eliminate the

requirement for a specific sequence when powering up the core and I/O voltage supplies.

6.1.1

Important Considerations

•

The voltage monitor does not eliminate the need of a voltage supervisor circuit to ensure that the

device is held in reset when the voltage supplies are out of range.

•

The voltage monitor only monitors the core supply (VCC) and the I/O supply (VCCIO). The other

supplies are not monitored by the VMON. For example, if the VCCAD or VCCP are supplied from a

source different from that for VCCIO, then there is no internal voltage monitor for the VCCAD and

VCCP supplies.

6.1.2

Voltage Monitor Operation

The voltage monitor generates the Power Good MCU signal (PGMCU) as well as the I/Os Power Good

I/O signal (PGIO) on the device. During power up or power down, the PGMCU and PGIO are driven low

when the core or I/O supplies are lower than the specified minimum monitoring thresholds. The PGIO and

PGMCU being low isolates the core logic as well as the I/O controls during the power up or power down of

the supplies. This allows the core and I/O supplies to be powered up or down in any order.

When the voltage monitor detects a low voltage on the I/O supply, it will assert a power-on reset. When

the voltage monitor detects an out-of-range voltage on the core supply, it asynchronously makes all output

pins high impedance, and asserts a power-on reset. The voltage monitor is disabled when the device

enters a low power mode.

The VMON also incorporates a glitch filter for the nPORRST input. Refer to Section 6.2.3.1 for the timing

information on this glitch filter.

Table 6-1. Voltage Monitoring Specifications

PARAMETER

MIN

TYP

MAX

UNIT

VCC low - VCC level below this

0.75

0.9

1.13

threshold is detected as too low.

VCC high - VCC level above this

Voltage monitoring

1.40

1.7

2.1

VMON

threshold is detected as too high.

thresholds

VCCIO low - VCCIO level below

this threshold is detected as too

1.85

2.4

2.9

low.

6.1.3

Supply Filtering

The VMON has the capability to filter glitches on the VCC and VCCIO supplies.

Table 6-2 shows the characteristics of the supply filtering. Glitches in the supply larger than the maximum

specification cannot be filtered.

Table 6-2. VMON Supply Glitch Filtering Capability

PARAMETER

MIN

MAX

UNIT

Width of glitch on VCC that can be filtered

250

1000

Width of glitch on VCCIO that can be filtered

250

1000

System Information and Electrical Specifications

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