CP2401-GQ Silicon Laboratories Inc, CP2401-GQ Datasheet - Page 61

• Manufacturer Part Number: CP2401-GQ
• Description: IC LCD DRIVER 48TQFP
• Manufacturer: Silicon Laboratories Inc

Specifications of CP2401-GQ

• Package / Case: 48-TQFP, 48-VQFP
• Display Type: LCD
• Configuration: 128 Segment
• Interface: I²C, SMBus
• Current - Supply: 620µA
• Voltage - Supply: 1.8 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Data Ram Size: 256 B
• Interface Type: I2C, SMBus
• Maximum Clock Frequency: 25 MHz
• Number Of Timers: 2
• Operating Supply Voltage: 1.8 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Digits Or Characters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1860

10.1. Port I/O Modes of Operation
All port pins use the Port I/O cell shown in Figure 10.2. Each Port I/O cell can be configured by software for analog
I/O or digital I/O using the PnMDI registers. On reset or wake-up from ULP mode, all Port I/O cells default to a
digital high impedance state with weak pull-ups enabled.
10.1.1. Port Pins Configured for Analog I/O
Any pins to be used for LCD should be configured for analog I/O (PnMDI.n = 0). When a pin is configured for
analog I/O, its weak pullup and digital output driver and receiver are disabled. Port pins configured for analog I/O
will always read back a value of 0 regardless of the actual voltage on the pin.
10.1.2. Port Pins Configured For Digital I/O
Any pins to be used for GPIO or Port Match should be configured as digital I/O (PnMDI.n = 1). For digital I/O pins,
one of two output modes (push-pull or open-drain) must be selected using the PnMDO registers.
Push-pull outputs (PnMDO.n = 1) always drive the Port pad to the V
logic value of the Port pin. Open-drain outputs have the high side driver disabled; therefore, they only drive the Port
pad to GND when the output logic value is 0 and become high impedance inputs (both high and low drivers turned
off) when the output logic value is 1.
When a digital I/O cell is placed in the high impedance state, a weak pull-up transistor pulls the Port pad to the VDD
supply voltage to ensure the digital input is at a defined logic state. Weak pullups are disabled when the I/O cell is
driven to GND to minimize power consumption. The user must ensure that digital I/O are always internally or
externally pulled or driven to a valid logic state. An analog signal applied to a digital I/O pin will result in increased
power consumption.
PxOUT.x – Output
Logic Value
(Port Latch)
PxMDO.x
(1 for push-pull)
(0 for open-drain)
PxIN.x – Input Logic Value
(Reads 0 when pin is configured as an analog I/O)
To/From Analog
Peripheral
PxMDI.x
(1 for digital)
(0 for analog)
Figure 10.2. Port I/O Cell Block Diagram
Rev. 1.0
DD
VDD
GND
or GND supply rails based on the output
VDD
CP2400/1/2/3
(WEAK)
PORT
PAD
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