LPC2158 datasheet(14/45 Pages) NXP

14 / 45 page

LPC2157_2158_1

Product data sheet

Rev. 01 — 15 October 2008

14 of 45

NXP Semiconductors

LPC2157/2158

Single-chip 16-bit/32-bit microcontrollers

[1]

5 V tolerant pad providing digital I/O functions with TTL levels and hysteresis and 10 ns slew rate control.

[2]

5 V tolerant pad providing digital I/O functions with TTL levels and hysteresis and 10 ns slew rate control. If conﬁgured for an input

function, this pad utilizes built-in glitch ﬁlter that blocks pulses shorter than 3 ns.

[3]

Open-drain 5 V tolerant digital I/O I2C-bus 400 kHz speciﬁcation compatible pad. It requires external pull-up to provide an output

functionality.

[4]

5 V tolerant pad providing digital I/O (with TTL levels and hysteresis and 10 ns slew rate control) and analog input function. If conﬁgured

for an input function, this pad utilizes built-in glitch ﬁlter that blocks pulses shorter than 3 ns. When conﬁgured as an ADC input, digital

section of the pad is disabled.

[5]

5 V tolerant pad providing digital I/O (with TTL levels and hysteresis and 10 ns slew rate control) and analog output function. When

conﬁgured as the DAC output, digital section of the pad is disabled.

[6]

5 V tolerant pad with built-in pull-up resistor providing digital I/O functions with TTL levels and hysteresis and 10 ns slew rate control.

The pull-up resistor’s value typically ranges from 60 k

Ω to 300 kΩ.

[7]

Pad is designed in accordance with the Universal Serial Bus (USB) speciﬁcation, revision 2.0 (Full-speed and Low-speed mode only).

[8]

5 V tolerant pad providing digital input (with TTL levels and hysteresis) function only.

[9]

Pad provides special analog functionality.

VDD

11, 27, 33 I

3.3 V power supply: This is the power supply voltage for the core and I/O

ports.

VDDA

Analog 3.3 V power supply: This should be nominally the same voltage as

VDD but should be isolated to minimize noise and error. This voltage is only

used to power the on-chip ADC(s) and DAC.

VDD(LCD)

1.8 V to 5.5 V power supply: Power supply voltage for the PCF8576D.

VLCD

LCD power supply: LCD voltage.

VREF

ADC reference voltage: This should be nominally less than or equal to the

VDD voltage but should be isolated to minimize noise and error. Level on this

pin is used as a reference for ADC(s) and DAC.

VBAT

RTC power supply voltage: 3.3 V on this pin supplies the power to the RTC.

SDA_LCD

I/O

SDA LCD — I2C-bus data signal for the LCD controller.

SCL_LCD

SCL LCD — I2C-bus clock signal for the LCD controller.

SYNC

I/O

SYNC — cascade synchronization input/output

CLK

I/O

CLK — external clock input/output

BP0 to BP3

42 to 45

BP0 to BP3: LCD backplane outputs.

S0 to S31

46 to 77

S0 to S31: LCD segment outputs.

Table 3.

Pin description LPC2158 …continued

Symbol

Type

Description

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