diff --git a/Adafruit_TLC5947.cpp b/Adafruit_TLC5947.cpp
index 612acf8..d98f5b2 100644
--- a/Adafruit_TLC5947.cpp
+++ b/Adafruit_TLC5947.cpp
@@ -18,7 +18,7 @@
 
 #include <Adafruit_TLC5947.h>
 
-Adafruit_TLC5947::Adafruit_TLC5947(uint8_t n, uint8_t c, uint8_t d, uint8_t l) {
+Adafruit_TLC5947::Adafruit_TLC5947(uint16_t n, uint8_t c, uint8_t d, uint8_t l) {
   numdrivers = n;
   _clk = c;
   _dat = d;
@@ -32,7 +32,7 @@ Adafruit_TLC5947::Adafruit_TLC5947(uint8_t n, uint8_t c, uint8_t d, uint8_t l) {
 void Adafruit_TLC5947::write(void) {
   digitalWrite(_lat, LOW);
   // 24 channels per TLC5974
-  for (int8_t c=24*numdrivers - 1; c >= 0 ; c--) {
+  for (int16_t c=24*numdrivers - 1; c >= 0 ; c--) {
     // 12 bits per channel, send MSB first
     for (int8_t b=11; b>=0; b--) {
       digitalWrite(_clk, LOW);
@@ -53,14 +53,14 @@ void Adafruit_TLC5947::write(void) {
 
 
 
-void Adafruit_TLC5947::setPWM(uint8_t chan, uint16_t pwm) {
+void Adafruit_TLC5947::setPWM(uint16_t chan, uint16_t pwm) {
   if (pwm > 4095) pwm = 4095;
   if (chan > 24*numdrivers) return;
   pwmbuffer[chan] = pwm;  
 }
 
 
-void Adafruit_TLC5947::setLED(uint8_t lednum, uint16_t r, uint16_t g, uint16_t b) {
+void Adafruit_TLC5947::setLED(uint16_t lednum, uint16_t r, uint16_t g, uint16_t b) {
   setPWM(lednum*3, r);
   setPWM(lednum*3+1, g);
   setPWM(lednum*3+2, b);
diff --git a/Adafruit_TLC5947.h b/Adafruit_TLC5947.h
index 6cd15ec..aec88df 100644
--- a/Adafruit_TLC5947.h
+++ b/Adafruit_TLC5947.h
@@ -23,19 +23,20 @@
 
 class Adafruit_TLC5947 {
  public:
-  Adafruit_TLC5947(uint8_t n, uint8_t c, uint8_t d, uint8_t l);
+  Adafruit_TLC5947(uint16_t n, uint8_t c, uint8_t d, uint8_t l);
 
   boolean begin(void);
 
-  void setPWM(uint8_t chan, uint16_t pwm);
-  void setLED(uint8_t lednum, uint16_t r, uint16_t g, uint16_t b);
+  void setPWM(uint16_t chan, uint16_t pwm);
+  void setLED(uint16_t lednum, uint16_t r, uint16_t g, uint16_t b);
   void write(void);
 
 
  private:
   uint16_t *pwmbuffer;
 
-  uint8_t numdrivers, _clk, _dat, _lat;
+  uint16_t numdrivers;
+  uint8_t _clk, _dat, _lat;
 
 };